Hi
Just recently when I drive the car after while and stop or on neutral start revving 1500 to 2500 rpm and after 15 or 20 sec back normal ,but not happening all time it does it sometimes any idea why?or what's the Problem ?

Cheers

 

OP,

What have you done, if any, to research this on your own? Have you read the FAQs? There is a link on idle there. A "SEARCH" might do wonders. Could be something is simple as injectors, dashpot, etc.

Also, was the car under load? air conditioner, lights, etc?

Any engine management being used?

The more details the better; however, I think you will find 3rd gen users helpful if you have shown that you have attempted to research the problem on your own. After all, this car is over 20 years old and I doubt that any problem you are going to experience has not been discovered before.

 

Probably a vacuum leak.

 

How do I know it's the injector,and what's dashdot means?
The car not under load just normal driving and it does this sometimes not all time also I have hks ecu 3.2, and the a/c removed I don't know what else to add that's all pretty much.

 

https://www.rx7club.com/3rd-generati...-forum-911608/