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problem with girlfriends car.
she has a 92 percedia v6 ...stock
seems to be idling high (2,000 rpm) for a long time than usual in the mornings. (ie 10-15 minutes)<p>also has a bouncing idle at stop lights bounces between 500 rpm to almost 3,000...<p>was thinking some proble with thermostat but was wondering if some mazada guru could advise. <p>Her distributor was changed approx 4 months ago.

When I had this problem a few weeks back it was down to the throttle body being knackered.

Open the hood and look if you see any cracked hoses.
Sounds like a vacuum problem.
If it was the thermostat it will overheat.
After running the engine for a while and stopping at the stop lights it will suck hot air.
Than the idle will flucturate even worse.
I'm almost sure that there is a hole crack somewere or the vac isn't working anymore but if that was the case I think the idle sucks al the time. not only at stop lights.