Please let me know what you find.....this exact thing happened to me and I put a new coil a new plug a new Injector and new connectors on the injector and the coil....still misfire on #4. Took it to the dealership and they said low compression on #4 and #5 but no misfire codes on #5. They wanted to tear it down and tell me to do an entire rebuild, best case scenario 2k$. I said no thanks just slight misfire at idle, only has 111k and it's getting 18.7 mpg so it can't be that bad. But I don't know where to go from here. I'm going to start looking at some other posts to see if I can get direction.
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