Since my car got fixed over the weekend, I tested it out and it worked fine. Got more power since they made my head like new, but when I was ready to park, and I put it on park, the rms started movin from like 1-2rms every second, making that sound. I was wondering if any of you know why this would happen. If you can reply.... I appreciate it..

 

Like the RPM needle was bouncing around?

Maybe when you took off your Intake manifold you messed up one of the vaccumn lines

 

Yea.. the RMP needle would bounce from 1 to 1.5 when ever its on park. Ill look at the intake manifold and all that see if theres anything wrong with that. So you pretty sure it could be that?

 

Check a couple things...

Missing vacuum hoses. Any vacuum leaks (manifold gaskets, etc...)
Air pockets in cooling system. Bleed air out thru bleed screw on T-stat housing.
Throttle cable too tight or throttlebody dirty/sticking.
Dirty/sticking AICV or FITV.