I have an 89 mustang gt and the problem I'm having is as follows:
Rough idle--searches for idle from 600-1000 rpm.
Stumbles under acceleration. Feels like its missing.
When shifting to Reverse (AOD) it will stall out. Stalls out even coming to a stop.
There only mod to this car is the Throttle body (BBK 70mm) that a previous owner installed.
Error codes came up as KOEO 34, 63, 66 and KOER 21, 41, 91. Cylinder Balance Test shows 3 on first run, 7 on second run, 5 on third.
Checked compression and its 170 for cyl. 1-4, cyl 5 has 180, cyl 6 185, and 175 for both cyl 7 and 8. Fuel pressure is 30 with vac, 40 without.
Checked for vacuum leaks and could not find any. Installed new cap, rotor, wires, and plugs as well as a new IAC. I've cleaned the MAF with MAF cleaner and set TPS to .98.
I don't want to be just randomly buying new sensors and stuff. Where should I start? Any help would be appreciated