Similar problem...
I have the same problem lately, notch. Do you have your EGR removed? I have mine blanked off and the plunger zip tied fully depressed. I have noticed a subtle "miss" sometimes when I gun it, and sometimes it is readily apparent when the motor is cold.
I have swapped plugs twice, checked tps, changed wires, new coil, etc...no luck.
Swapped a old tps and IAC back in to see if it changed anything and it still does it.
Next step is a reinstall of the egr plate to see if that cures it.
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1988 GT Convertible
331 10:1 TW heads, GT-40 intake, MSD, TRW flattops, B Cam w/ 1.7's, MAC exhaust, 24's, 70 TB, 76 MAF, 3.73's, Pro 5.0, Koni's, Anderson PMS, Wideband 02, yatta, yatta...
One week with new motor, two speeding tickets...joy
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