I just recently purchased a 1989 RX turbo AWD with about 180K miles on it. On the test drive i didn't drive it hard cuz it needed an oil change and had bad gas in it. After changing the oil, oil filter, plugs, wires, dist cap, as well as adding new fuel and lucas injector cleaner i went to take it out for a drive and this is where I realized there was something wrong.
Upon acceleration it sputters, backfires and basically stalls out (but then as then speed and rpms fall back down it attempts to keep running). It is drivable but only with being very gentle on the gas pedal.
I have tried a new throttle position sensor, a reman'd mass air flow sensor, and also just for the heck of 3" turbo back exhaust. The new TPS and MAF seemed to make a little improvement, but still something major on in there.
Any ideas? Could it be the ECM?
Thanks