Hey yall. my beloved 2000 Tacoma 4cyl 4x4 has probs. Idle is smooth at a cold start but after heating up the #4 cylinder misfires, bad. CEL 0304. New plugs and replaced the coil on the #4. Any idears?
thanks

 

I am dealing with some misfire problems myself.

Check the injector on Cylinder 4. Also, you mentioned the plugs and coil were changed. Are they genuine Toyota parts? Did you change the spark plug wires as well?