garland, What was the answer? Later, JR ----- Original Message ----- From: <Vairdad at aol.com> To: <virtualvairs at corvair.org> Sent: Wednesday, March 24, 2010 2:01 PM Subject: <VV> timing mark jumps help timing mark steady for > a few seconds then jumps about one inch then steady for few seconds then > jumps again. > garland