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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

Bucket seat. Not power seat. Lift front handle and nothing. Was a problem of locking in place .now just stuck forward.

How do replace it and what tools do I need?

This is first time drove fine getting to my house but now cant leave can it be wrong parts

What is my issue

Can't even begin to get it to start. Motor just turns and turns

Engine just turns over. It don't even begin to fire

I can't tell where the transmission fluid is leaking from, it is all down the lines and leaks sometimes more than others...

changed the throttle body and no difference still idling too high

- I have Checked harness resistance from sensor to main connector. ok
- have checked sensor input voltage, 5v on both sides, at big connector and through the harness to sensor.
- I concluded to replace wheele hub assembly. Problem still persists.
- All other three sensor register a speed on scanner when wheels are rotated.

The car runs fine, smooth. No missing or backfires.