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454 engine surging when warm Jim 7-8-15  
My 1992 winnebago starts evry time but when it gets warm after about 5 minutes driving the engine rpm starts to surge up and down and the "service engine" light flashes the whole time.
I tried to do adignostic check but got no results. I linked the two terminals together as instructed but the light did not flash in the suggested sequence which would give the number of a fault code, it simply continued to flash on and off as before. Can you please give me some advice as to a possible solution because obviously I cannot drive the vehicle in this condition. Thank you.
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