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Pontiac Grand Prix GTP Questions

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I have had it checked by a mechanic and he says it is a sensor. I wanted to know how easy is it to repair it?
In the middle of the doors and also below the doors there are sections that have some type of molding that makes the car look sporty. These parts have come off and I would like to know how I can get them replaced.
Pontiac Grand prix gt
Only when idle when driving it runs fine
My GTP has 128K on it and I just very recently found out about supercharger oil maintenance. I'm unsure if mines ever been looked at and wanted to know more about it and possible warning signs of being low. Thank you!
The dealership wants $910
Please help
When I am driving down the road and I get on the gas the car shakes. If I keep on the gas the check engine light will flash. I've already replaced the spark plugs and wires. This occurs all the time. Also I've notices lately that when I start my car sometimes it has problems starting. It'll idle rough, bog down and sometimes die. Other times it'll fire right up. I've replaced the battery and checked the alternator. It almost seems like it's not getting enough gas to compensate for the power the car needs. Help please.
This doesn't happen all the time but is getting more frequent.
I had my oil changed yesterday and had to tighten my air filter clamp and my boost is still not kicking in and I'm making mountain of a molehill or is there a issue I need to check out. Love my car and she was slacking in power this morning.
Dies unless you keep it above 2500 rpm and stalls out when you stop
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