gmc cohking

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I bought a used chevy 1991 sub 2500 a month ago w/ a new distr, new cap wires plugs, and 108000 miles great shape.. there is no cat/conv. ran ok when bought now whenever the vehicle warms up and i am cruising at 55-65 and i give gas, the vehicle chokes, not hard and the problem is worse in damp weather. replaced ig/coil and fuel filter,,,,also unplugged egr valve, no difference in operation. please advise..

posted by  jets99

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