P0304

2002 Montana code P0304 light was flashing now solid, swapped coils no change, new plug and wire no change, found air box plugged solid from hibernating mice cleaned out thats when light went from flashing to solid still misefire. I've been told its the injector. Any help much appreciated:jerking:

You cleaned out the air box.....did you also pull out the PCM, and check the wire harness? Probably find a nest there also, and they ate the insulation to the injectors there.....

I checked cylinder number 4 compression was 30lbs, currently there are no coolant or heating issues or coolant and oil issues what could be the problem.

Wow, 30 psi is not good....should have min of 100 psi on all cylinders....

Leak down test would tell you if it's a valve, piston or head/head gasket.....