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Pontiac Grand Prix Questions

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I am replacing the coolant temp sensor and pigtail and need to know what the best way is to connect the loose end of the new pigtail?
just bought this 2008 Pontiac Grand Prix with 158,000. runs good. Should I be concerned with replacing timing chain or any other component for maintenance? I drive out of town a lot and don't want to get stranded.
won't switch gears, won't settle in park




Car stalls won't start for 10 minutes or longer runs rough had ignition modulator replaced and oxygen sensor

underneath near the oil pan



Was driving on the freeway then my car suddenly turned off. I had it towed home. Checked the oil and noticed it was extremely high, so when I went to drain it about a quart of water came then the oil....so i was told to change the head gasket...so i bought the head gaskets, but upon further research ive read that the intake manifold can cause this problem...so my question is what do i need to repair?? I'm kinda stuck on what I should do...plz help
Ive got new struts but everytime I hit a bump on the rear passenger tire I hear a rattle
When I stop for a short period of time, my engine kicks (struggles). This is happening when I put my foot on the gas (doesn't matter if I lightly put on foot on the gas). Please help.

Pontiac's are HORRIBLE!
I've replaced the bulbs & replaced fuses. Still does not work. I have to run my high beams on the entire time. What should I do?

Thanks
my car stalls when i first start it then i need to give it gas to start it again but then it runs fine.
My heater/A/C control panel isn't working anymore. It was working intermittently for a while, only blowing heat or cold on fan 5 setting, and turning off my headlights when it went off unless manually turned on, then it went out completely. The rider information display went off and on with the A/C, and now it's off too. Is there a fuse I need to check? Or some other information somebody can give me? I have an aftermarket stereo, and that works perfectly. The A/C and rider information display both worked for several months after the stereo was installed. I did have an issue with the ignition switch when I bought the car, but that was fixed as well, and the A/C worked for 2 years after that. Any ideas?
I had the key for my car copied and didn't realize that it wasn't a microchipped key. My car was running perfectly. Then I tried to start the car with the new key. Started fine, stalled 3 seconds later. Did this twice, figured out the new key wasn't microchipped. Have been using my original key since. However, now my car won't accelerate, even on highways. Once up to running speed, it runs great, but it still sounds like it wants to sputter and it seems to sputter louder when idling. It doesn't stall, it just sputters. I don't know how to describe it, but when attempting to accelerate, it feels like the car can't breathe. Any ideas?
We have replaced the ignition module(once) and the crankshaft sensor (twice). We are still having the same issues, stalling/ not restarting and no dummy lights to show what's wrong. We took it to GM to have it fixed but they tell me nothing is wrong with the car!!!!! I know there is something wrong with the car and its not safe to drive my toddler around in!!
My car will not let me put gas into tank - pump shuts off and will not allow anymore gas in after about 1/2 gallon goes in
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