When you rev up the engine at idle there is no load on it and the timing will not move very much. Itsnot like the old mechanical advance units that moved with rpm. You mention that its worse when cold, possiblity of coolant sensor or ACT sensor. Check your codes.
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Bill Heiser
90 Convertable 5.0 LX, ported E7s w/ THumper valve job, TFS street, FR 65mm TB, B cam w/1.7 cobra rockers, kirban AFPR, Mac CAI, Mac Headers, off road h, 3 chamber flows, Crane ign. box, 3:73s, Art Carr AOD & 2600 converter
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