changed cop/compression tested/noid test/ohm test all good.reset and code returns when ac is applied at idle for extended time. rough idle and jerky. misfire...
Ford Q&AAsk Your Question
2002 Ford Escape Question: check engine po303 cylinder 3 misfire only occurs under idle while ac is on
Answer #1pushrod August 23, 2013, 23:59Master
Only thing left is a vacuum leak near # 3
Replymcreynoldsscott, August 24, 2013, 00:14Rookie
probably the only thing I haven't checked for yet, however the engine runs smooth under all conditions,until the ac is applied. I will try the vacuum leak angle just to be sure. Thank you for the quick response.