hunting idle, stalling

[GMR911]

My car has developed a hunting idle and stalls when coming to a stop-RPM's drop quickly and car stalls. I have read that air leaks in the cis can do this, also a rich mixture. Any thing else? Any ideas? The car is a 77s w/ a 78 3.0L cis motor

[longhornchris04]

Probably running rich, but an air leak could cause this too, if it was rapid onset. If it was gradual, then your mix could just have slowly gotten out of whack.

When I last adjusted my mixture I ran into this until I got my mixture lean enough to run cleanly. Run a search for the full details but all you should need is a 3mm hex wrench, fairly long.

There's a hole on the driver's side of the fuel distributor by the rubber boot. CCW leans, CW enrichens. Make small adjustments (1/8th turn). Rev the engine a few times after any adjustment - use the throttle linkage on the other side of the rubber boot.

Once the hunting is gone, you may still be a little rich. My trick was to find a long, empty stretch of road (tough here in LA). With the RPMs at around 3k-4k I would release the clutch and see if the RPMs fall too quickly. Pull over, adjust, and repeat until I was happy. It was about 1/8th a turn past where the hunting stopped, but YMMV.

Unfortunatly, if it is an air leak then its a bit harder to diagnose. Good Luck.

[86 911 Targa]

Check the vaccum lines at the rear of the air meter.

Good luck,

Gerry