greeting all I am racking my brain trying to figure out what is causing my 05 4.0 with 80,000 miles to have a rough idle and a light miss audiable at the exhaust. The plugs were replaced with factory plus and gaped to specs.The wires were check and verified to be seated on the plugs,Trottle body and MAF were cleaned, no air lek found. acceleration good as is driving at all speeds. Anyone have any thoughts? I am brain dead from this. Beginning to think it may be an injector. No codes stored or found.