check engine po303 cylinder 3 misfire only occurs under idle while ac is on on 2002 Ford Escape

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...

Asked by for the 2002 Ford Escape
1 answer 1 comment
Only thing left is a vacuum leak near # 3
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.