Like the title says. The car will rev fine and drive fine the first trip around block, then comes the violent bucking. My mods are greddy Ti exh. non- seq, pfs purple piggy back, koyo rad,greddy BOV, and thats the main ones I can remember. I searched and found DAMIANS grounding system that I made my own and installed. Helped but not the fix, I will be adjusting my TPS to DAMIANS other thread in the Archives this weekend. Can anyone else offer any info?? No loose vaccums or broken hoses( Job just done) Plus I just changed the turbos and all fluids @ 2FAST here in Orlando and they did a compression test and told me it was good, and the motor sounded and ran in good cond. I would really like to figure this out w/out having to spend more money. Ive been on the forum and in Archives ALL week, can anyone else offer any advice? thanks in advance.-Erik

 

Install a fuel pressure gauge and see if your fuel pressure is correct during the 'episodes'.

dave

 

Sounds like it's going lean, perhaps after it warms up a little. Check the TPS carefully (in addition to the fuel pressure dgeesaman mentioned--it will buck like you describe if it's running out of gas).

 

I actually just welded the bung to wide band and installed sensor. This weekend I will wire it up. Its an AEM unit, and though not a FPR I would still see fluctuations in the AFRS if thats where the problem is? As far as the gas,Speed of light, Ive kept her @ half a tank using 93 only. And @ low rpm just on take off it bucks and sometimes turns off if I dont play the gas pedal to keeps Rpms up. Also while driving she sometime sputters and you can almost feel it coming on if youre not "on" the pedal. Thanks guys, much appreciated.

 

stock ECU?

 

yes....piggy back peter farrel unit(purple PF supercars)