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I have a '91 940 turbo / with rolling idle problem (very intermittent/annoying)
a few days ago when it acted up I unplugged amm and rpms smoothed out and engine had a smooth high idle. I then plugged amm back in and engine stalled
immediately, I called nick@ FCP Groton, they sell alot of AMMs. He advised
strongly against reman / New ones $40.00 or so more but most reliable.
If that does not fix I would solder or replace Fuel Pump relay, next I would
replace RPM sensor ($50.00 @ dealer). Good luck.
First thought was bad fuel pump relay !
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