Just a suggestion, The 89 did this same thing immediately after installing a new TB, EGR spacer and K&N filter. I had to reset the computer to get it to quit doing it. Maybe it's having to relearn the fuel/air curve with the new heads. Also, it did it again the other night just all of a sudden like. After some head scratching in the dark I found the air filter has fallen off. You have a cold air kit. . .might the filter have fallen off?
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1986 four-eyed LX coupe, 358 Cleveland, Tremec TKO600/centerforce clutch, dish cut Probe forged pistons, comp cams hyd.roller cam, .579/.588@224/230, Edel.performer, 670 holley street avenger, CPR custom built long tubes, ported and polished 4bbl heads, manley valves, beehive springs, MSD peo-billet dist/MSD6AL, fluidamper, 5 lug conv. with 17x8 bullits there's more but it's still not finished yet.
Oh, and the oldest boy is turning his 89 GT into a FFR cobra this next summer.
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