My gsr started stumbling on the road recently. Its almost like its choking. It'll go for a second then stumble, then go and then stumble again. It even does this while i'm on the interstate. Sometimes it stumbles pretty bad. Can't figure out whats wrong with it. CEL came up for tps sensor, but after I turn off engine....the light won't come back on. New Omni tps sensor is on the way, but if its not that, any other input is appreciated...Thanks.