Slight hesitation between 1600 and 2000 rpm in drive. 88 gta 5.7 auto. New Accel 8.8 wires, cap , rotor, cts, mat sensor, IAC, bosch platinums, fuel filter, TPS set at .56 and smooth to 4.30, bosch o2 sensor, maf relay and burn off relay, ignition module has been checked out OK,and as of tonight a MAF sensor. FP at idle is 38 and with vac hose off around 50. This has all been done pretty much in order. This has all helped and themaf made a big diff, however I still have that hesitation. Funny thing is I went for a drive with the maf unpluged and it felt like it wanted to Fly. Only codes over the past 2 months have been burn-off rely, maf code when it was unpluged and est code when I disconnected it to set IAC. 120,000 on car and all parts replaced seemd to be original. Any Ideas would be great. I want to fix this myself, but may have to take it to the shop. Also, this all started coming about right after winter when it started to get warm outside. Thanks

 

Ya know, I replaced my MAF and O2 sensor at the same time, MAF was bad and allowing too much fuel through the engine, so I figured after 250 for a MAF, I'd replace the O2 sensor as well.

The engine would kinda surge from 50-60 mph range, fine above 60 or below 50. Pulled over and disconnected the battery for a few minutes to clear the ECM, took off and it's been fine ever since.

Only thing I could figure was that the part throttle learned values in the ECM were used to a richer runnng engine..who knows, give it a try.