Scott,
The issue I have is a off idle lean hesitation with both a 4bbl and efi.
Rpm between 900- 1300 rpm the engine "surges" lean watching on an AfR gauge regardless of engine load.
I've been holding the throttle in this position and letting the efi l"earn" here, but I feel it's more of cam thing.
I had timing at 12 intial with 10 vacumn (22 total at idle) with the MSD distributor.
Now using the dial sync, the ecm controlling spark, the ecm is running in the same values so I think that's good for initial.
Vacumn at idle using a vacuum gauge, I have 16ish" at idle drops to 5" when you move the throttle.
I think advancing the cam may help a bit.
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