I had a 89 f350 with a 351 W it did the same thing and I did the same thing too as you done never could find it, mine would idle fine sometimes for hours. Then would act up when you don't need it to like sitting at a light.
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Mark Anderson - Nebo NC - western NC - RV Restoration tech - 9 Doggies - Outdoors person
1990 33ft Wilderness Cimarron 33X
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