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454 engine surging Jim 7-8-15  
My 1992 winnebago starts every time but when it gets warm either after 5 minutes driving or about 10 minutes idling the egine rpm starts to surge up and down and the "service engine" light flashes the whole time.
I tried to do a diagnostic check but when the A and B terminal were linksd together the light did not flash in a sequence to reveal a fault code - it simply continued to flash on and off as before. Can you please help ?
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