My truck 5.7 Vortec has a slight misfire at 60 MPH and 2000 rpm and steady speed. No codes. No miss under slight speed increase or heavy throttle. Repaced cap and rotor last year, and ran injector cleaner, fixed it. But now it's back, ran injector cleaner again, no fix. Ideas?
Thursday, January 17th, 2013 AT 12:38 AM