after everything I replaced , what else could be causing my misfire on the #2 on 1996 Mazda B4000

I have replaced the spark plug, spark plug wires , coil pack and fuel injector. but my scanner still detects a missfire on the number 2 cylinder. What else could it be.

Asked by for the 1996 Mazda B4000
Low compression, vacuum leak or no injector pulse to that injector. Code P0302 to start with?
yes P0302
Ok, check the 3 things i posted.
1 more answer
poss wiring to injectors or coil pak