SteveP

I have a basically stock 5.0 engine (mild cam upgrade) in a 92 Mazda Miata. The car starts well and idles a little rough at 700 rpm. Driveability is good, but when the car warms up, the rpm hangs between 2000 and 2500. Installed a new IAC, no help. Car is a 5 speed with A9P EEC. Any suggestions would be greatly appreciated.

Gunpilot

Adjust or replace TPS?

charchri4

I'd bet a vacuum leak in one of the systems that is temperature sensitive like the canister purge or EGR.