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Discussion Starter #1
So I have a very intermittent problem with my speedo. It will jump all the way up to ~60 mph while at a stop, while idling, and drop back down to 0. Its only happened like 3 times in the year I've had it but I was wondering if someone might know what could cause this weirdness.

Also, probably unrelated, but sometimes when I am slowing down almost to a stop, my rpms will drop to ~500 almost stall, then go back up to the normal ~800, then drop back down to 500. It will do this about 5 times before it settles down back to normal idle. I think it happens more when it's quite cold outside.

Any ideas on things to check?
 

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I had the issues like you have with the RPMs. I cleaned my throttle body and the decrease in RPM stopped.

As for the speedo, I have that issue randomly after I shut off the car, the needle will jump. My guess is a stray current somewhere. Maybe a loose ground, or a worn through wire.
 

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Discussion Starter #4
Mine does it while it's running, and it's not a twitch, it's almost a half sweep of the needle.
 
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