Having a hard time with this one. Cold, runs fine for a few minutes, plenty of power. Warm, misfires while accelerating at any speed. Hot, misfires increasingly. After a few hours it's running on one or two pistons. Runs fine after cool off.
Recently, I replaced vacuum hoses and fuel filter. Swapped the 2 map sensors to see if it did anything different. Didn't.
Code says 300 random engine misfire. Autozone printout said ASE technicians would recommend reprogram PCM. I don't have a tuner. Does anyone know what would be most likely or what to test first?
Thanks.
