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truck not running right


99ta

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93 s10 4.3l

started running very rough this morning. Shakes really bad at idle and all the time for that matter. My intial thought was a spark plug wire had come off. Checked all those and they were fine. Should I start with changing all the plugs and wires? or try something else? any input would help. Thanks

 

Eric

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I have a 95 5.0L Chevy truck. It acts the exact same way. I have changed the plugs, wires, dist. cap, and rotor, even replaced the fuel filter. The # 1 plug corroded after 4-5 000 miles. I am thinking valves? What do you guys think? I should say my truck has 175,000 miles on it , all from pulling a tandem axle landscaping trailer or plowing snow everyday of it's life.
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