I have a 1986 RX7 non turbo. When I start it the idle goes up real high and then back down. Then it continues to bounce the idle up and down, almost like it is surging. I have read the it could be an air flow problem, but where should I start? Could it be the cold air sensor?

Any help would be appreciated.

 

TPS or timing is out of adjustment

 

I have changed the plugs and wires. It was running fine and then sat for awhile (2 weeks)and is now doing this. What is the TPS?

 

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/frequently-asked-questions-2nd-generation-rx-7-faq-fc-494667/

 

Thanks. Where can I find the TPS = Throttle position sensor?

 

Top of the motor, next to where the MOP rod connects to the throttle body

 

Thanks, I will take a look.