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Q: hard to start after driven or a hot engine. have installed new fuel pump on 1993 Chevrolet Corvette

when the engines cold if fires on the first turn
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I suggest you check the electrical resistance of the fuel injectors. Check cold then check again hot. Shorted fuel injector winding[s] can cause this symptom. The resistance readings will change with temp. however the individual injector resistances should all be the same or close to the same.
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