1993 965 216,000km.
Once my car is up to operating temp I'm getting an intermittent fluctuation in idle and a stumbling when maintaining a consistent speed. There is also a hesitataion on acceleration. Runs fine when cold and while warming up.
I first noticed this on the highway at 120kph in cruise. Engine felt like it was surging, very slightly, but enough for my passenger to comment on it. Then when we got off the highway and were pulling up to a stop sign the tach dropped almost to zero (didn't stall) and began flipping between about 200 to about a grand. I put the car in neutral and reved the engine once and the idle smoothed for a second or two, then started doing the same thing. I can feel the fluctuation at 50kph(30mph)in city traffic also. So far have replaced plugs and cleaned throttle body. Any ideas?