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Re: 2004 Alero 3.4L Idle and Missing Issues.
There should be three wires on the TPS. One is ground, one is the constant 5V reference, and the last is the signal back to the PCM. Verify that the signal from the TPS is correct first, since it can affect some of the other potential problems.
Your description of the symptoms is helpful. It may indicate a rich/flooding condition. This could be a result of an incorrect TPS signal or other problems, such as a leaking injector(s), leaking fuel pressure regulator, or other possibilities.
Opening the throttle to start the engine admits more air, counteracting any rich or flooded condition. The fact that it starts "better" when cold is another indication, since a rich mixture on cold start is more conducive to starting.
The rough idle and misfire are other symptom of excessive fuel, as is the exhaust odor.
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