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Well, sounds like a plenum leak to me. When that leaks, it makes a loud whine and runs like poo. Also, I have an oil separator on mine. It has a petcock on the bottom to drain it. My usual MO is to put a rattle can lid under it, open it and walk away. Several times, I forgot it was open, and started the truck. Runs bad, cough and spits, real jerky in gear. Did it yesterday. Hurr Durr!!