Need Help ASAP!

[90KA24E]

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!

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. :pface

[drjohn]

The bad idle could be the coolant temp sensor connector,tps adjustment , injector or airflowmeter connections or faults in these items. Changing the gear oil in the trans and differential is easier done on a lift and is not to costly. And if you take it to the shop have them check the idle problem.

[90KA24E]

No one know what is wrong and they are all red necks Chevy fan 1000%. I am the only Asian or not white and drive a import in the whole shop. so no one know how to work on this puppy!

Is 20-22MPH good for a KA24E?