I have a 380 SLC that won't idle unless I hold the airflow sensor open a tiny bit with my finger. Once it's running, the plate seems to open and close just fine with the throttle, but it will die at idle. Also, the manual says there should be .1 to .2 mm clearance all around. This one appears to be tight all around. I already had the whole unit off to reattach a vacuum hose on the throttle body, and couldn't find any other vacuum leaks or anything that would explain this.

Any ideas? Thanks!