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b5demon
b5demon, Technician
Category: Jeep
Satisfied Customers: 3720
Experience:  ASE and Chryler/Jeep master technician for 17 years
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Cheroke: i have a misfire code of p0300 and another code of

Customer Question

i have a misfire code of p0300 and another code of p0420 and it chugs on start up and then is fine when it is warmed up?? any suggesttions?
Submitted: 1 year ago.
Category: Jeep
Customer: replied 1 year ago.
The check engine light blinks when it chugs and stops and stays on when it doesn't chug. Doesn't happen on every startup. Mostly when it is wet or damp outside. But is starting to happen more frequent now.
Expert:  b5demon replied 1 year ago.
Hi Welcome to Just Answer! How many miles are on the jeep?
Customer: replied 1 year ago.
72,000
Expert:  b5demon replied 1 year ago.
Have you tried replacing anything yet?
Customer: replied 1 year ago.
No I have not
Expert:  b5demon replied 1 year ago.
ok usually the first thing to do with a miss fire code is a tune up
Customer: replied 1 year ago.
Ok after I do a tune up and it still exists?
Customer: replied 1 year ago.
????? So what do I do if it still happens???
Expert:  b5demon replied 1 year ago.
The next thing to do if the spark plugs don't help would be a compression test

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