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Pontiac Sunfire Questions

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2002 Pontiac sunfire, 2.2L

The car is in great condition, in the process of doing a little work to it. I am in the process of doing a little engine repair as per the codes I got when I gave it a test. I want to be sure that I am on the right track, and Im just curious if anyone can offer assistance.
First I was getting a misfire code, so this weekend I am changing the spark plug and then checking the cables a distributor.
Second was an RPM code, which said it was reving high. And I can notice this when I drive it. As it revs high before I get any real power. This is the main issue. And my suggested fix was the idle air control valve, and then fuel filter.
It appears to be getting fuel, so I dont believe its a pump issue.
3rd was an issue with a temperature circuit, likely a relay. But would that affect anything major?
And the last code was for the 02 sensor, which I replaced already.

If there is anything that I should do extra on top of what I am doing, can someone advise any other courses of action other than what I am already doing.

Thank
pulled out of driveway. shifted to drive. no click of shifter. runs in reverse, but won't shift to drive.
I got the car not too long ago and my windshield freezes and the defrost didn't work
My pontiac sunfires lights stopped working i checked the bulbs and connections but nothibg seems to be wrong. If it is the relay fuse where is it located and how many fuses or fuse boxes do i need to check?
wont shift into second gear
No clutch pedal
Leaked out all fluid from cylinder
Clutch pedal has no resistance
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The car runs decent. Sometimes it act it has a slow ideal on take off. But if u turn the Ac or heat on it dies
Also, the check engine light is on
I have a 1999 Pontiac Sunfire that want start. I have already installed 3 starters in my car and my car will run 2 to 3 days and then it want start again.
i had a full tune-up and engine light came on and stays on, took it back had it reset, they told me it was internal, what does that mean, also oil sencor replaced too and after driving a bit when idle it comes on also. i paid 900.00 for mt repairs, i also relaced the AC motor
First off, I'm quite sure the catalytic converter needs replaced. I'm not sure if this would effect the A/C performance, but just recently the A/C stopped blowing cold air. After adding coolant, it works but only when the car is actually 'going'. When idling, it blows hot air. Then once I take off, it gets cold again. Also, I can smell the fumes from the catalytic converter and wonder if it being clogged might be correlated to the A/C running inefficiently.
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