Pontiac Grand Prix P0410- Idle Goes Up And Down

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Question:
2002 Grand Prix GT 3800 6 cylinder. Diagnostics done at GM dealership. Bought new battery.
Question: My car will sometimes die on the first startup and then crank on the second try. The rpm gauge will jump to about 1500 rpm's, then drop to zero and then level off at about 900 rpm's. It has also started to die when you put it in park and it has died when you turn the air conditioner off.

We took it and had a diagnostics ran but they could not find anything. We also have the abs and trac light on and we had that repaired about a year ago or so we thought. We recently moved to Texas from South Dakota also and I know heat can cause more problems. So that is my question. What causes this?

Answer:
Couple of things i would suggest. Clean the throttle body bore, plate, idle air control valve (IAC) and its bore. If these things have carbon on/in them, it will cause the problems you describe. A leaking fuel pressure regulator can also cause this. When they leak, fuel enters its vacuum hose, and can also cause these problems.

Let me know what you find.

Question:
1998 Grand Prix 3.8L. Sitting at the stop sign and it will die and when you take off from the stop sign it will also die. The car does restart fine but then does it all over again.

Answer:
There are several reasons for this code. You may have a blown fuse(s), a bad A.I.R. Pump, or a sticking diverter valve. Be sure to check all the fuses in the underhood fuse box. If any are blown, the pump may be faulty and blew a fuse because it is shortled out internallt. Sometimes they will even burn the wiring harness for the pump. If this is not the case, a diverter valve may be sticking and not allowing the pump air flow to enter the exhaust to clean it up and the oxygen sensor will see this and set a code P0410.

Question:
2001 Grand Prix code P0410. Replace airflow sensor. Question:
Trouble code p0410 is a Secondary Air Injection System (A.I.R.) malfunction. What am i looking for.

Answer:
There are several reasons for this code. You may have a blown fuse(s), a bad A.I.R. Pump, or a sticking diverter valve. Be sure to check all the fuses in the underhood fuse box. If any are blown, the pump may be faulty and blew a fuse. Sometimes they will even burn the wiring harness for the pump.

If this is not the case, a diverter valve may be sticking and not allowing the pump air flow to enter the exhaust to clean it up.

Question:
Pontiac Grand Prix GT 2002. The car has a 3.8 liter V6 3800 series 2 motor. I bought the car and it had a missfire but would go away so I changed the spark plugs and wires. The spark plug wire on the back right of the motor was almost burned in half but I got the wires and plugs changed. When I start the car I noticed the tachometer was not working and the car was running alot worse then before.

Missing, not wanting to idle, backfiring some but if I would give it gas it seem to run better and if I would hold the gas pedal for a minute or so I could let of the gas and it would idle on its own and seem to straighten up. But it would act like it run out of gas and I try to pump the pedal it might die out or it might back fire and die or it would start running but with a miss. What could be wrong?

Answer:
If it ran worse after the parts changed, i would have to ask that you make CERTAIN you got the plugs and wires in the correct order first of all. Dont assume previous owner had them in the correct firing order, make sure you got it right. How did the ignition coil towers look? Check for a bad MAF sensor and proper fuel pressure.