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john charlton · 06-18-2019, 10:24 AM

I have changed the cap as I have had that short between 3 and 4 before and I binned that cap . I put a new one on also I have changed the carb . The truck runs fine at highway speed and the plug is dark grey not oily black so I think on load the engine is running normally . I think I would notice if I was 25% down on power also if I am passing a lot of unburnt fuel through the muffler there might be other symptons also my gas mileage is still 20 MPG or thereabouts .

John same place same weather.

06-18-2019, 10:24 AM	#4
john charlton Senior Member Join Date: May 2010 Posts: 1,304	Re: Mystery Missfire I have changed the cap as I have had that short between 3 and 4 before and I binned that cap . I put a new one on also I have changed the carb . The truck runs fine at highway speed and the plug is dark grey not oily black so I think on load the engine is running normally . I think I would notice if I was 25% down on power also if I am passing a lot of unburnt fuel through the muffler there might be other symptons also my gas mileage is still 20 MPG or thereabouts . John same place same weather.