Engine Performance problem
1994 Other GMC Models V8 Four Wheel Drive Automatic 149000 miles
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7.4L 454 WONT STAY RUNNING UNLESS WE UNHOOK THE VAC. FROM THE MAP SENSOR BUT EVEN WITH THAT IT STILL RUNS RICH AND WHEN WE HOOK IT BACK UP IT STARTS THEN STALLS? PUT IN NEW PARTS - FUEL PUMP AND SENDING UNIT, FUEL FILTER, TIMING CHAIN AND GEARS, TPS SENSOR, MAP SENSOR, DIST. CAP & ROTOR, WIRES & PLUGS, IGNITION CONTROL MODULE, STARTER SOLENOID
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