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Re: Truck misfiring after sitting for a couple weeks
spray ether on parts of the manifold and near the gasket, see if it changes the surge for the worst. Cracked manifolds will also manifest themselves worse at higher rpm's as the vacuum builds (or boost if it were turbo).
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING 
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