RPM reving up/down while slowing down

vetabeles
Wed, 12 Oct 2011 16:22:39 +0000
Maintenance/Repairs

I have a 2006 Scion Tc, its a manual and 2.4L engine. It has about 75,000 miles on it and everything in it is stock. I have recently changed my ac compressor due to the old one went out. It was properly drained and recharged after I replaced it with a brand new one. It has been working great since, but I noticed in the past couple days that if im driving and I put the car in neutral while still moving (to save gas) my RPM’s will shoot down (like normal) but then it will start bouncing up/down until I come to a complete stop. Once im a complete stop the RPM will stabilize again like if there was no problem. Take in mind that in im getting of the highway coming to a stop light I will put the car in neutral and begin to slowly brake, the clutch is not engaged nor im I stepping on the gas. Why would my RPM’s go up and down. also the AC was not on and the RPM will not do this while driving. Any ideas would be great. Thank you.

16 posts - 6 participants