Rough Running Dually

[nekkidhillbilly]

when you put your foot on the gas does it stumble less. tps sensor on a tbi will actually open the gas like a choke would on a carb. when they get weak they wont open the gas enough and cause it to stall or stumble. my tbi grand am done this. the injectors themselves sometimes will leak too causing it to dump to much fuel into and stumble. after that the o2 sensor or the vac lines are the only thing else i can think of.