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spits amd sputters when accelerating under load and flashes a p171 code new this year,tranny, spider inj. set, tune up,fuel filter ,o2 sensors . is it possible the mechanic has de-tuned my truck to save his tranny?any help would be greatly appreciated. thanks in advance

follow up ,... problem fixed, spider injector set replaced 700.00 ouch!

maybe o2 sensor?

97 tahoe 160k new plugs,wires cap and rotor still idling rough with #8 misfire code, recent smog any suggestions what to do next?