Need Help ASAP!

[90KA24E]

Need Help ASAP! My car right now Has a hole under the muffler the size of my hand and it missing the tip theis above it.

Here is my ?s.

1. My car idal jump up and down never stay at the same place. If it get too low the car will shake for that one sec and soon has it jump back up it be ok. The car drives great when it's above the idal speed or whe the push of gas. Is it because of my Exhaust?I try fuel Injector cleaner. And 1 time it idal at 1500 but after a push of gas it went back down to 600-700 up and down again! I don;t want ths car to die on e so soon I only have it for 2 weeks.

2. The car has 108000 miles on it and I want to change the 5 speed tran oil and want to know what I need and how to chnge it?

3. I think there is oil in the rear I forgot what that thing call and I want to change it too. I know what the thing does but forgot the name.

Please Help me on it I been a Honda Die Hard Fan and Always Woke on FWD but never RWD drive so please help me people I wuld rally thank you.

[C-Kwik]

I doubt that the exhaust has anything to do with it. You may want to try and clean yur idle air controller. Check for air leaks in the intake as well. I'd pick up a Factory Service Manual as well. I'm having a hard time understanding your post, so it may be easier if you try to use the troubleshooting section of the factory service manual. You can also use it to help you with the basic maintenance.

If you want help with the part you don't know the name for, please try and describe it as best as possible. I'm thining you are referring to the differential housing.

The big difference between FWD and RWD cars is just whch wheels drive the cars. The cars will work in a very similar fashion, so you don't need to know too many different things to work on either.

[90KA24E]

I will try to clean the idle air controller tomorrow. I try to use fuel injetor cleaner ad it does not work!

Ok the 2d and 3rd I had was how to change the oil for the 5 speed tran and differential . Sorry I should Of try to makethe story short so it be easyer to read!;)

An Is 20MPG good or AVG or Bad for a Stock KA20E?By the way my car is a 90 240sx coupe with 5 speed and KA24E!