Had cylinder misfire when purchased car. Replaced spark plugs and coils, ran great for couple days, started running rough. Trouble code said misfire #4 and 5. Cleaned plugs, ran good for couple days then rough again trouble code said misfire #3 and 4, clean plugs and MAF. Ran good couple days, then rough again. Trouble code said misfire #4 and 5, cleaned, re-gapped plugs, reset PCM. Ran good for about 4 days now rough. Trouble code now says misfire #1 and 3, also new trouble code P1131. What do I check or repair/replace next?
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Sunday, May 16th, 2021 AT 9:02 AM