Looking for some help. I have 1993 GMC 1500 4.3L and the problem I'm having is around town the truck runs great. But, once you get over 60 MPH the truck engine light comes on I lose power and you can watch the gas gauge drop. If I slow down the light with normally shut off and it runs great again. Once in a while I have to shut the truck off and when I turn it back on the light stays off. When the light is off the truck idles smooth has power. But, when the light comes on forget about it eats the fuel, no power.


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