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RarlyL8 RarlyL8 is offline
Crotchety Old Bastard
 
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Join Date: Jan 2000
Location: Huntsville, AL
Posts: 13,308
Garage
Cruise rpm should have nothing to do with boost until the air resistance (speed) requires an engine output beyond normally aspirated. You should be in vacuum when at cruise.

Double check the dual pot vac lines. Vac retard at idle does nothing harmful when unplugged, vac advance becomes purely mechanical when unplugged.
Surging indicates an air leak or mixture issue most typically. An ignition issue may clear up at higher RPM.
Verify the timing is set correctly and has not been set to compensate for this issue.
Old 02-18-2014, 10:42 AM
  Pelican Parts Technical Article Directory    Reply With Quote #11 (permalink)