You may have a burnt valve or blown head gasket. Run a compression test on all cylinders.
I have a 95, had a misfire... mine was because of the plug wires... changed the wires and plugs mis fire stopped...
Spark plugs
Theres three coil packs; one fires two cylinders. I suppose if one is bad then it could cause the two corresponding to misfire. I had one cylinder misfire, it turned out to be the fuel injector.
I had that happen n I changed my plugs n coil pack...easy to do
It means # 3 cylinder has a misfire. My advice is to replace all the spark plugs, and check the spark plug wires carefully.
P0300 : multilple misifreP0302 : misfire cylinder #2Check plugs, wires, injector, compression, etc.see related question below.P0300 : multilple misifreP0302 : misfire cylinder #2Check plugs, wires, injector, compression, etc.see related question below.
fuel injecters bad
Some more info would be good. 1. How many miles? 2. How are you reading code? 3. How did the Coil look when you changed plugs( very common problem) From what you said i can assume the next place I would go is the coil.
you either did not gap the plugs to spec or you put this wires on wrong
p0302 is cylinder 2 misfire, you need to fix the cause of the misfire. Possible causes are plugs, coils, injectors......
P0303 is cylinder #3 misfire. P0300 would be random misfire. Either way you need to diagnose the case of a misfire. Check spark plugs, plug wires(if equipped), cylinder compression, fuel inectors, and wiring.
P0304 is a cylinder #4 misfire, start with new plugs and plug wires.