Problem with my 1999 Pontiac Grand Prix
Replaced spark plugs and wires.
My engine misses and stalls at stop signs, and sometimes runs normally then misses again.

Answer:
Well, this could be many things. Could be a fuel pressure pressure problem. Low pressure caused by a plugged fuel filter or failing pump.
An ignition coil or module going bad causing the misfires.
A crank shaft position sensor.
A leaking fuel pressure regulator (FPR).
Bad computer (PCM).
Need to find out what cylinders are misfiring, then diagnose why. - Are those cylinders loosing spark, injector pulse ?

Ignition Turns With Key Out

2003 Pontiac Grand Prix
Engine Size : 6 cyl
Question Here: when you turn car off with key engine turns off but does not shut everything off then when you easily remove key you can still turn ignition and start and drive car.

Answer:
Sounds like you have a problem with the ignition cylinder and / or the ignition switch. If the key turns all the way off but things still have electrical power, then the ignition switch is the most likely cause. If it turns with the key out, then the ignition cylinder is faulty. The ignition cylinder is what the key goes into, and sits inside the switch. the ignition switch feeds power to most of the car systems.

Question:
Problem with my 2001 Pontiac Grand Prix. Engine size = 3.8L (VIN k). Repairs for this problem = EGR Valve caught on fire, can't find replacement part.

The EGR Valves we have found (internet, parts dealers) will not fit my car. They have a plug on the top, whereas the one we need has no plug but instead has a vacuum hose.

One dealer said if we found the numbers on the old valve they could order a new one; however, the old one melted when it caught on fire and we can't see the numbers. Any help/info/advice you have to offer will be GREATLY appreciated. Thank You!

Answer: The reason that nobody can get you the correct EGR valve you are looking for, is that there is no EGR valve that runs on vacuum for this car. They have been electronically controlled for years. Some possible causes for you problem...

• This is not a 2001 3800 engine
• Someone has replaced the EGR Valve with the incorrect style
• This is a much older engine in the car
• The part you are looking for is not the EGR Valve.

The part you are trying to replace may be the Secondary Air Injection System Check Valve. This can be confused with EGR valve. This has a vacuum port.