Yea, I forgot that "Closed TPS Spark Advance" table, my stock was at 20* for 400-800 RPM, I found setting 400-1200 at 34* and moving other settings up a few degrees as RPM increased helped smooth out...

syn, 1st as stevo said make sure your intake path after the MAS is tight. I run a mild LT4 hot cam on my '94 LT1, (218/228 @50 112LSA , .525/.525 lift w/the 1.6 RR's) . I had to get my idle up to...