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If i rev the engine it will back fire thru the throttle body...if i stop fast it will stall,if i go up a steep hill it will start to stall and shift out of overdrive..it will stall if i try to punch it and take off..if i put it in tow mode..overdrive off.. it seems to work better..i have no...

when i first start out? it has a 318 with a throttle body..ive put new plugs cap rotor and wires..new tps.watertemp sensor.map sensor and egr valve..cant find any vacum leaks..when i get up to speed and am just cruiseing at 55 it will drop in and out of over drive..but seems to ok in tow...