im new to the manual transmission thing and i have a question. This problem just arised the other day. I shift through the gears and let say that I bring my car to about 4000 rpms and let off and put it in neutral, well my RPMS stay up and come down very slowly..Just started in the last 2 weeks. I only have 38k on my car. Whats is wrong?

 

Plugs might be running hot, and the engine could be doing almost like a "dieseling" action, where the plugs still set off the fuel even with no additional throttle.

Could have a sticking throttle body.

If it didn't used to do it, it's not because of a heavy flywheel. I'm sure there are other reasons... that sounds strange though. Good luck.

 

I've had a similar problem before. It was the throttle position sensor. At first I thought it was the idle air control motor. The TPS had normal voltage and resistance, but it was still the culprit.

 

thanks folks, ill try that. that why im on here!! any others suggestions?