Thermactor???
I still haven't seen you say you have checked the thermactor crossover tube that bolts to the rear of the cylinder heads.
That definitely sounds like a good exhaust leak when there is a problem there.
googd luck...
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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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