[PrimeMvr]

No I didn't abandon this thread, it's just taken longer than I expected to sort this out. I replaced the dist cap/rotor, plug wires, cv boot and installed an AFR gauge.

Tonight I started it up and the idle was still very rough and AFR was 9.2. Here's where it gets interesting. The pinch test on the AAR had no effect, so I pulled the hose between the IC and AAR and the AFR went to 12.7 and the idle smoothed right out.

Plug the hole to the AAR and it stalls. Not much change if the IC hole is plugged. There is good vacuum at both the AAR and IC hole. This leads me to the theory that there is a battle for air flow in the hose that feeds the AAR and nothing is flowing through it when it's connected to the IC.

Now what? I'm stumped on where to go from there. I assume the air should be able to flow freely from the IC through the AAR or the AAR would be pointless. Too much air restriction on the cold side of the turbo? I've read a ton of "rough idle" threads but none address this type of issue.

After 4 minutes of idling with the hose off, the AFR ran up over 17 and the engine stalled. I assume that was the engine temp telling the WUR to change fuel flow? At this point, with the hose reconnected it idled a little rough, but better.

After a drive the idle is smooth and stuck at 900rpm.

Thanks guys. Steve