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Hello, my name is***** it run fine under 4000 rpm? Does it act like it has a rpm limiter and not want to go above 4000? Thanks.
Does the check engine light start flashing above 4000 rpm? Is your check engine light coming on at all? Thanks.
Are you getting a specific cylinder misfire or random cylinder misfire? Does the check engine light flash?
Have you tried swapping around the coils to see if misfire follows coils?
Hi there different expert here.
You tried a new coil and coil wires or just the wires?Also, how many miles on the car?
Aftermarket or factory parts?
I would inspect the wiring harness to the ecm from the coil, and also take a look at all the ground wires around the engine compartment. I have seen the grounds cause some major issues on these cars. Inside the engine there were some issues with the valve guides dropping or shifting when the engine was running, but I believe this wasn't an issue on the newer models.
It would also seem unlikely that it happens to be the 2 across from each other. usually the flashing check engine light does mean an ignition failure but not always. You may want to disconnect and reconnect the ecm harness as well.