2002 Infiniti I35 Misfire

I'm sorry I should have said -the engine has a slight misfire only when the AC is being used ? [email protected]

check for a vacuum leak if check engine light on scan for codes and check fuel pressure. autoparts rent the gauge

The things you mention have been done at a Infiniti dealership garage-- Still misfires if the AC is used- I spent $1300 for nothing !

so thereare no engine codes nor the fuel pressure is at the correct pressure? try cleaning throttle plate on both sides with choke cleaner and iac hole I can't think of anything else other than what I've mentioned. you might have your battery checked for condition including load test autoparts does for free