I need help. I have a 2001 Celica GT. Car seems to run normally at low speeds and RPMs below 3000. When I accelerate or speed up though, the car jitters and won't accelerate smoothly. It's like your riding a horse where it keeps on jerking. Now from what I read (and I'm no expert at all), the engine seems to be misfiring. The car also gives out a lot of smoke and I can always smell smoke when I get off the car.
I already tried the ff:
1. replaced all spark plugs
2. clean the MAF sensor
3. just recently had my oli changed and Air Filter
4. did a fuel injector test where you remove the electrical connections of each injector to see if idling will become rough,
I am totally out of ideas. Anyone know what might be wrong with my car or what I can do to diagnose better?