When you refer to jumping, it it advancing after being set to the initial DGs so that you actually have to move the distributor to retard the timing back repeatedly? Make sure you double check the timing after you tighten down the dist. They can move a bit when you snug them down.
You must disconnect the advance before setting the timing and that should be around 6 DGs BTDC. when you reconnect the wire for the ECM to control the spark advance is should immediately add a few degress of timing. Should be a single wire plug I think along the fire wall by the brake booster?
Make sure when you set the timing you scribe a line to verify the distributor it's moving. If you timing is still changing/advancing then I'm look into the Ign module/pick-up.
Also check that there isn't excessive play in the rotor / distributor that would be a sign of a possible bad cam or dist. gear. Are you running a cam that requires a bronze gear?
Is the idle staying stable?
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
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2) Race it
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