Originally Posted by greenbean699

Your oil cap may be hard and therfor making it really hard to come off.
You can get new ones at the auto parts store.

Your ECU is designed to turn the sensor light on so you will take it to the dealship.....but all you need to do is take off the kick panel and eset the sensor light. Yes this is the lil philips head screws that hold the panel on.
Turn you key on and then mash the button. I believe its on top of the box....or maybe on bottom....cant remember.

As for idle goes......well vacume has alot to do with that....check for leaks.