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What are all the mods? Do you have cats or not? My 2000 with the longtubes and dual cats was on the edge of the stock computer settings with it adding 12-13% fuel while cruising. Do you have a tune yet? If not, then that might solve your problem. You might also have a weak injector that is causing a lean cylinder and a misfire. Have you had someone scan it while driving? I have the Diablosport that can show some realtime data.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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