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first thing to check would be ALL the vaccum lines going to the motor. there is one that is on the front of the throttle body for the non-vortech motor that is prone to coming off. so if any have slipped off, slide them back on and use a pair of pliers to twist a piece of tie/bailing wire tightly around the line to keep it from coming off

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Q: What would cause 1989 Chevy s10 pickup 4.3 engine to start running eratic Problem started while driving 65 mph under no load. Had been running fine before.?
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