Re: backfiring
You're running lean...you've likely increased the volume of air but haven't added fuel. The PCM is trying to, but can't add enough.
Best bet is to get a AFPR, and tune it with a wideband O2.
good 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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