Toran

Hello Porsche Lovers,

Got a really rough idle and thought it was a bad batch of gas. Changed the plugs and still idles rough. Acceleration is fine and the engine doesn't make any knocking sounds.

Could the provided image help?
Image is from car running in neutral, no foot on pedals.

T.I.A.

944Ross

It's idling fast for a fully warmed up car, economy gauge is about where mine runs.

Toran

And well after the warmup period the idle is still rough.

Swagger93

Plug wires, injectors, wire harness, fuel pressure regulator, fuel damper, fuel filter, vacuum leak (unlikely unless it's hunting), dme temp sensor, computer failure.

I've had plug wires fail very suddenly. 1994 Miata went from cruising no problems to complete misfire on one cylinder instantly.

Is it running rich? Did you try unplugging injector wires and see if one doesn't make as much impact on running when it's disconnected?