My 1993 2.3L LX has been experiencing a driveability problem lately. When the engine is cold, it has a bad part-throttle sputter (more accurately it runs like absolute crap and wont accelerate, and backfires). If I floor it, it clears out and runs good. Once the engine is warm there are no problems at all. I already checked the EGR valve operation and also cleaned it out. Any help is really appreciated! Thanks!

See how it starts adding up if you just start throughing parts at it