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The engine is a 350 4 bolt main with throttle body, truck is k1500 4X4
I notice even after the engine is hot and idling that the exhaust smells rich in unburned fuel, I'ts like in the old days when a carbuerator needed adusting badly and the engine was getting too much fuel. A thought, could the computer be dead, this happened to a friend's truck and it ran poorly in some kind of emergency mode (just quessing).