Need Diagnostic Help

Shri2222

Need Diagnosis Help.

My Z with 15k miles after being parked for an hr after an hr drive. Runs fine. I have AFR and OPS gauge installed. Smooth idle, revs fine without load, no check engine light, steady AFR 14.1-14.7, all gauges read perfectly.

The car will not accelerate, I have to put my hazards on to merge; it is that slow. It accelerates as if I'm only giving it 15-20% throttle with the pedal floored. It takes about as long as a city bus to get up to speed, and it can not maintain speed uphill. The a/t Trans shifts smoothly in manual mode and seems to shift smoothly in standard as I slowly accelerate and slow. The AFR is perfect, with no sputtering, nothing that indicates a mechanical issue. The car doesn't pull or decelerate unusually either, so there are no stuck calipers.

I tried putting it in cruise control to see if it could maintain 70mph on the highway, but the cruise light just flashed when turned on and would not set cruise.

Does this sound like a pedal position sensor failure? or is it something else?