Ok so currently i am running a 92 350 TPI with headers Hi Flow cats, and no mufflers. I noticed the problem before, but it has gotten worse. The car is very jerky. On a partial throttle it will start bucking. if, im going down hill and gassing it, then all of a sudden stop gassing it, it will wind down and then it'll hit a point in the RPM where it will jerk and decelerate quicker (like when you hear a semi truck going down hill--"pbpbpbprprarparpaappa"-is how it sounds ) i am stumped on this now. I have done a complete tune up, fuel filter, and it should be running better than it is.


I also thought it might be due to the lack of backpressure???


Any Help or ideas?

Thanks,
Boldguy

 

Check your TPS sensor voltage to make sure there are no dead spots.

Also, check the fuel pressure at the rails to make sure it is steady

Hope this helps.

 

TPS voltage flows steady and goes down as
-> WOT. I noticed that it doesn't do it when its cold (ie night or morning) but when it warms up it'll be bad as ever...
Thanks for the input. Have you had this problem before? or has anyone?
im starting to think IAC valve...