the engine is a rebuilt 350 (010 block) 9.somethin to 1 compression, 1.94 heads (came stock on the motor), a Crane 272H energizer cam (.454/.454 lift, 218 adv. dur.) with an Edelbrock performer intake and a non CC q-jet and distibuter. The cap, rotor, plugs, and wires were replaced about 5000 miles ago. Its also got edelbrock headers, a catco cat and an Edelbrock cat back.

Now on to the problem. the car hasn't been driven for any decent length of time in about 3 months (paintjob) and when i started driving it again thi past Sunday i noticed that it seems to stumble a lot more. At first whenever i would SOTP, the car would bog and jerk to life and then bog again pretty much giving me whiplash. I figured it was bad gas so i filled it up with Sunoco 93 and it helped somewhat. Now it doesn't jerk very much although theres still a faint jerk in a couple places. My main concern is that about half of the time when i SOTP and bring the rpm's up past about 4200 the car just dies, and won't pick up anymore until i shift. I don't even really know how to really describe it except to say that it dies. So does anyone have a clue whats going on? im' completely lost here and i need to know what to look at/for.

Thanks for your help,
Eric

PS- on a side note, whats the biggest cam i can put into a stock LG4 without doing any work besides changing the cam and lifters?



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My 1986 Z2814.59@95.6

GM350, T-5, 3.23's, lots of go fast goodies, 4th gen Firebird interior etc...
85 IROC w/ 1364 miles! no times yet, just got it to start.

You'll always find what you've lost in the last place you look

R.I.P Dale Earnhardt

Moderator at: www.generation-3.com

 

Oh boy, but this is just guessing.

It sounds like fuel delivery. Check to see if the fuel filter is plugged and that the fuel pump is working. You might just have to try a different pump to see if that's the problem.

It might even be the coil. I had a bogging problem that I thought was a rods or hanger problem after putting on headers and a 3 inch exhaust. Turned out that a 50,000 volt Proform coil fixed that problem. Don't ask me why!

 

when I had my talon it used to do that, It bucked like hell after like 5 grand, and it ended up being a combination between my injectors and my throttle position sensor. . . when I replaced the injectors it wasn't as bad, but still did it, so it was more th TPS. . . get it checked out with a voltimeter. . . do TPIs even have a TPS??? oh well, check it out, it could just not be adjusted right

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1987 Pontiac Firebird Formula 350
1 of 2,384 made, Black with Silver decals
350 TPI
700R-4 Tranny with TCI shift kit and Corvette servo with TV boost sleeve
TCI saturday night special 2200-2500 stall converter
WS6 supsension
SLP headers with full 3" exhaust exiting through an SLP dual 2.5" tip muffler
SLP airfoil
180 degree thermostat
hypertech "performance" chip
3.73 rear
Viper talkin alarm with remote start
My 383 is in the process of being built right now, hopefully to make it's debut by middle December. . . many more mods to come in the summer. . maybe some experimentations with juice. . have some track times my independence day.

 

ITs not a TPI, and the distributer has a built in coil. (the earlier style HEI) Im gonna go and buy a new fuel filter, along with a pressure guage and a good coil and see what that does for it.

thanks for the help so far, and keep the ideas coming, the more the better.

Eric

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My 1986 Z2814.59@95.6

GM350, T-5, 3.23's, lots of go fast goodies, 4th gen Firebird interior etc...
85 IROC w/ 1364 miles! no times yet, just got it to start.

You'll always find what you've lost in the last place you look

R.I.P Dale Earnhardt

Moderator at: www.generation-3.com

 

BTTT, any more suggestions?

 

I'm not sure what kind of dying you mean exactly or if this even pertains but my car used to sort of die after 4000 rpm. The engine would sound fine but it just wouldn't pick up until it shifted. I thought it was the transmission but turns out my problem was a rear end going bad. I put in some new 3.23s with posi-traction and havn't had any problems since.

 

hei control module?

 

I had the same problem. It ended up to be my fuel pump. I let the gas get past a 1/4 of a tank and suddenly all the same problems started to happen.

 

I had the same problem. I found a tech artical on the broad here that tells you to adjust the spring tension on the secondary valves of the carb. what this does is to allow the valves to open quicker. Solved my problem. Here is the link to the https://www.thirdgen.org/newdesign/tech/quadrajet.shtml

 

sounds like a carb problem, clean out your carb first, you said body shop and that ='s DUST. check your fuel filter , and you want to also check your float level, you might also have crap in the accelerater pump too , look and see what metering rods you have, you can change them (there's like 40 different ones) to fine tune stuff. they can cause a lean mix at higher rpm's. if all that is good , check your timing , you may need to adjust it to get the performance you want . (i had a carb on my old 350 that did the same thing , the float level fixed mine) good luck