I continue to get misfires over and over, not always the same plug. P0302,P0303,P0306. how do I know if it's plug or coil. I had all replaced a year ago maybe a little more and I have replaced 4 plug and coil, since June. is there a reason, and can you check the coils without having to swap coils to another plug? and those damn clips, is there a way to make it easier to come off? I know a lot of questions. thank you in advance.

 

Any other codes? There can be other reasons for misfire. Could be serious.

 

not at this time just the mis fire codes. Never any others ...yet

 

I just had the AC redone, so should not be a leak.

 

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Not sure why that would matter to a misfire.

You could have wiring issues to the COPs, fuel issues, etc. Misfires are bad news, should get it looked at fast. Or test more things yourself.