The engine coolant temperature sensor could be stuck in the cold mode. This would activate the cold start injector even with the engine warm--and flood the engine with too much fuel, making for long crank times. The engine coolant temperature sensor (ECT) is usually located close to the thermostat housing. It has two wires coming from it. The coolant temperature sender for the dash gauge is not the same. It only has one wire and grounds through the engine block. It is easy to get them confused.
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