SOURCE: truck runs great and drive on freeway wants to cut
seems that you might have some water in the gas tank. get some gas dryer and pour in the tank. 2 half pint bottles should do to a half tank of gas. good luck.
SOURCE: 98 Chevrolet Silverado runs rough at half throttle and past.
try removing the EGR valve and clean inside of it and manifold
SOURCE: i replaced the cap, rotor, plugs, wires, o2 sensor
Mine was doing the exact same thing. You will need to crank it up, raise the hood, take the oil cap off, place your hand over the hole, and if it sucks on your hand you have a blowed intake gasket.
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