Neil, Best not fool with that just yet, all you will be changing is the total degrees of vacuum advance, not when it occurs. The usual cause of a part throttle stumble is the accelerator pump, check that first. You could run it down the road with the vacuum advance disconnected to see if it makes a difference, be sure and check the ground wire on the distributor plate in case it is breaking the connection when the vacuum advance moves. Mike At 12:14 PM 11/27/2004, eastern sierra Adj Services wrote: Does anyone have any experiece in adjusting a vacuum advance? H.'s got a "part-throttle-hesitation", a flat-spot, after he's already driving down the road, & the throttle's depressed. I understand that the V.A. can be adjusted, using allen wrench, but the V.A. is a tad "remote" on the pre-B-block motors, so I don't wanna get involved in a big 'project', if there's not much ease/chance of adjustment without using a timing gun, or 'scope', etc. ************************************************************* To unsubscribe or set your subscription options, please go to http://lists.psu.edu/cgi-bin/wa?SUBED1=l-forwardlook&A=1
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