Re: 2002 grand cherokee limited 4.7HO
Welcome to the garage.
Did you check for any fault code set?
That the rpm jumps, is probably due to the torque converter clutch releases.
It could come due to the TPS, but also due to a speed sensor, a shift solenoid or pressure switch. How does the transmission shift through all gears?
Did you check the level and color/smell of the fluid?
If no fault codes and fluid looks good, i would start changing the TPS.