A rev limiter will not affect it while driving down the road. Do you have any codes in the computer ?

Answered by saturntech9 (expert)
23,190 answers provided

There are no codes. Have had it checked with GM Tech II and everything checks OK. All sensors, injectors, fuel pressure and timing issues appear to be ok. While driving down the road i have a slight surging and thought that maybe this surging up and down while in park could somehow be causing the driving issue. Throttle body has been cleaned; 2 different maf but not a brand new one; monitored fuel pressure with gauge on windshield while driving; new IAC and TPS. Voltage and grounds have been checked

Response from herb1948
2 questions asked

Have you performed a back pressure test on the exhaust?To see if you have a plugged cat?

Answered by saturntech9 (expert)
23,190 answers provided

There is less than 1 psi back pressure. I would buy new MAF if I thought it would solve the surging problem. I have freq. tested the MAF but not at high rpm when the engine is surging up and down as it would just send a surging freq. back to the ECM.

Response from herb1948
2 questions asked