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1999 Sierra 2500 6.0l Starts great, idles great, runs like crap cold on acceleration above 1500 rpm ( light or heavy ) . No power, back firing, missing etc. Runs great once engine temp hits 85C. I have replaced intake manifold gasket, MAF sensor, re-programmed CPS, checked EGR valve, fuel pressure is 60psi, replaced plugs and wires, vacuum is strong and steady, replaced engine coolant sensor. Any help is greatly appreciated. Thank you
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