Here's a question for all you CIS experts out there. My buddy's car, K-Jet Basic same as mine, ran 'er on the dyno last night. After fixing a bad distributor, we got stuck on trying to dial the mixture in. It was stuck on full rich, PIG-rich, at around 10 mid-run. By leaning out way bigtime, we got it up to around 11-flat mid-run, but still no-where near the low 13's my car runs.

However when messing with the setting at idle, I had NO problem getting it so lean that it was off the charts for the tailpipe wideband sniffer (over 19.0).

What could cause this condition? It's got a new/fresh rebuild warm-up regulator on there, so that should be fine.

What about the fuel delivery pressure? Based on advice from others, we'd bumped it up to the top end of the acceptable spec (don't remember the value). I'm wondering if that might be flowing too much, despite the control pressure being correct (verified with the proper gauges)?

Any help, suggestions, etc are appreciated...