Still sounds like an ignition problem but....
I also get that effect when my engine oil gets old.... runs like @ss cold then runs ok once it warms up. Maybe the ignition advance is the problem. Doesnt a cold engine need ...less advance?
Check the plug wires in the dark. I once had a wire get fried and could see sparks jumping to the headers.
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91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior
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