High idle and shifts

Hey just wondering if anything knows why my engine idles high now and when ever i put it into drive or reverse it shifts hard into them? could it be something with the tranny?

Always post the year/engine; there are a lot of variations through the years.

High idle can be a lot of things; two common causes are a vacuum leak (check hoses first) and a faulty or dirty idle air control. Here's the procedure for cleaning that if you are so inclined.

I'd start with that and if your idle comes down, your shifting into gear is bound to go a lot smoother. Good Luck!

Cleaning the IAC:
1. Remove the IAC with a torx 15 driver (2 bolts)
2. Gently wiggle out the IAC from the throttle body
3. Clean the IAC with throttle body cleaner (not carburetor cleaner ) Use cleaner, a rag and a toothbrush and or Q-Tips. Be gentle; don’t twist or pull on the pintle as it is fragile and you can damage it pretty easily
4. Also clean where the IAC seats in the throttle body with the same throttle body cleaner
5. Consider cleaning the entire throttle body itself as long as you’re at it
6. Reinstall IAC and check idle quality

92xj wiht 4.0 s6 and auto trany

alright thanks!