Engine Misfire diagnosis: As we shake the cob webs off the 98 Envoy from being parked for 3 years an engine misfire developed. An audible snapping noise could be heard from the engine bay while the misfire was occurring. A quick visual inspection revealed one of the spark plug wires was arcing to the exhaust manifold. This one was an easy diag, just a faulty spark plug wire boot! | Candy Shop Customs