well i just bought a 750 dp quickfuel ss from a member off the board...


after numerous moving of vaccum lines and helicoiling two studs in the intake mani i got it on and running, car ran real good, then the fuel line started leaking, tried fixing it today and things got bad.

yesterday the car started right up and ran real good, today it seem to run really rough, seemed like a miss, while driving i couldnt get the car over 3 grand and the whole time it sputtered and acted like it was trying to die jut around the block.


i dont hear it sucking air, and the idle doesnt hang so i dont thing its vaccum...


so my two thoughts are a fouled plug or the carb is loading up, niether of which i have dealt with so how can i spot them?

and if anybody has any other possibibilties let me know.

also i have a holley red electric pump and i had it pumping fuel for 10-15 seconds while i was checking for leaks, and i had started it after a hour or so sitting, it ran better but still real rough around 2500 rpms


thanks for any help in advance

 

ttt

anyone got any ideas?

 

have you adjusted the carb at all? Did you ask what jets are in it?

When i got mine, it seemed like someone had converted the jets to square jetting, but also left the powervalve circuit in there. The fuel bowls were set WAY too high, and i couldnt get it to run much. A few adjustments corrected that though, and it runs great noiw.

However, if youre having probs, ONLY above 2000rpm, you might have a timing issue.

Also, check your choke, and make sure its staying open. My choke has closed on me a couple of times at the track when vacuum was too high. It'll behave exactly like youre describing if that happens.

 

Another thing came to mind also.
What do you have your fuel pressure set to?

I had a similar problem and found out my bypass regulator was not sending the correct pressure to the carb.

 

First I would check the float level and jets size. Pull the plugs and see what they look like. Sounds like the carb needs tuning.

 

the carb is stock jetting and everything, it ran really good, then just decided not too run well, how would i go about making sure the choke is fully open


the fuel pressure is a constant 7psi with the holley pump i think...

 

If you have a manual choke, just ziptie the mechanism fully open. You have to be fairly high in the revs, and let off all of a sudden, to create enough vacuum for it to close.

If its electrical, just unplug it, or wait long enough for it to open.

But you may have a fuel issue if it behaves like that above 3000.

Another though, check your fuel filter, maybe its clogged?

 

ya i didnt even think of the fuel filter, took it out today and its great under wot, but under light throttle it feels like it eases up a bit


the carb is electric choke and its unplugged...

 

Sounds like you sucked some trash in the carb.

 

today its running as bad as ever, started right up first time ran decent for about 20 secs then got real bad, changed out the fuel filter and it did nothing...

i did notice looking at it that the front left fuel bowl is only a 1/4 of the way full but the other three are completely full....would this be a sign of a problem?