Just replaced two orange screw on resistor caps on spark plugs but can anybody explain the reason for the resistor being there ? and if a cap shows to be "open" meaning no continutity ,can't the high ark just jump the gap ,so to speak? when one goes bad how does that affect performance? what are the symptons at idle ? does it affect gas mileage ? I haven't tried the engine since the new caps went in ,but i've been having problems with erratic rpm idlling like dancing between 400 to 700 and slow speed in gear stalling,not always but most of the time, and on the hose at home the tach stays around 700 rpm but only runs for 10 minutes then i shut the engine down.The engine is a 2001 250hp turz efi.
