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After warm engine cuts in and out/Surges till only idles

Engine

Vehicle Information: Year: 1979; Engine (Size, Modifications): 3.3; Total Mileage: 94,000;

Fresh Re-Build, starts right up,engine cuts out at 3200 rpm, or anytime you run rpms up that high, then as you drive the thresh hold becomes lower and lower til it will idle only. Shut the car off for 5-30 minutes and you will get 1/2 -1 mile before it starts again. My mechanic said it was old gas since the car sat for a couple of years, and he neglected to drain all the gas out after overhaul of engine and transmission. Thank You

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