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986.2 misfire at high rpm
Hello all!
I've currently been trying to hunt down the cause of the misfires on my 2003 Boxster S with 84k miles. It started off as a Bank 1 Knock sensor, which was replaced. After changing the fault for the censor went away but the misfire still persisted. The codes are P0300, P0301, and P0304. Afterwards I read on forums and replaced the spark plugs, and coil packs. Even after replacing those, the codes still persist. It's an awkward case since the car doesn't misfire till it hits 5,000 rpm and pulls hard up until then. I've switched around the spark plugs and coil packs with no luck. Has anyone else encountered something of this nature before? The air filter I've replaced, and the IMS was replaced at 79,000 miles. I'm currently at a loss on what it could be. I don't see any bore scoring, compression is great on all cylinders. I'm stuck on what could be the cause of the high rpm misfires.
I greatly appreciate anyone's help! Thank you!
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