I have a 87 GTA with a 350 TPI auto.The problem that I have is when cruising down the road in 4th gear at low rpm it is surging and bucking. I check the fuel pressure and it good. Also replaced plugs,wires,cap,rotor and fuel filter.It also has headers and K&N intake if it makes a deferents. THANKS

 

Though I should wait...

Has the K&N recently been serviced and reoiled?

 

The filter is brand new just put it on. I the got the car wrecked and it ran and drove but couldn't drive it very far. I will put the stock filter and intake on and try. THANKS

 

Remove your MAF sensor and inspect the inside of it. If it's got too much carbon built up on it, it can cause problems like what you've described. You can remove the screen and clean it with an old toothbrush and some soapy water (dawn dish soap works the best I've found). Allow it to dry thoroughly before reinstalling. I've had 2 MAF cars with symptoms like you've described, with a dirty sensor being the culprit.

If that doesn't help, you may also have a bad TPS.

 

Don't touch the MAF. Unplug it if you think it's causing problems, if so, chances are good the problem is with the relay(s) not the MAF.

Do not touch the MAF unless you are rather familiar with them or don't mind screwing up and paying through the nose for a new one. And PLEASE don't pull the screen off, 99% of the time it is not needed nor worth it.

 

Even with a bad relay, won't it still require cleaning after it's fixed?

Disclaimer: This is what has worked for ME. If you don't feel comfortable or don't know what you're doing, don't touch it.

 

No it should not require cleaning (and carbon in the MAF? mucho reversion?), ours is a hot wire MAF not a thick film MAF. My initial response was tounge in cheek b/c I don't like K&N filters and they also have a reputation of messing up the latter thick film MAFs after re-oiling.

Our hot wire MAFs clean themselves when working properly. (Well, unless it was replaced with a WELLS or similar thick film unit.)