Id bet its in your exaust. I replace my collector gaskets [stock type manifolds] about once every 3 weeks. They just refuse to last any longer. If you have a broken flexplate, you'll be able to spot the cracks if you look real carfully while turning it over by hand. If its out of round, then with the dustshield removed and the engine running you should be able to spot it.
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-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle.
-98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes.
-02 Suburban 4x4: leveled front
-CBR600F4i, CBR600RR, CBR1000RR, and standup skis
DISCLAIMER: I cant spell for the life of me.
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