Vacuum leak?

I just ran over 100,000 miles in my 05 Tacoma. At 90,000 they say to replace all the hoses. I didn't do this and I just replaced the 2 hoses for a PS leak. Now my rpm gauge is jumping around some time at idle it's 750 other times it's about 1200. When I'm driving and I take it out of gear, it's a stick, it just stays at 1500 until I break to a stop and then drops to 1200.

What do you guys think?

I just did calipers rotors pads and rack and pinion. It's lifted 2.5" and runs really good other than this idle issue. I've only had it a year and would like to work this out and keep this truck alive as long as possible. Are vacuum leaks expensive to fix?

Thanks for the help!

 

Check the throttle body