1991 Dodge Stealth intermittent hesatation-iddle sometimes

Hi im a shop owner for over a year -i have over 13 years in the field and I got a customer car, a 1991 dodge stealth 3.0 dohc -stick-non turbo-alrite this is whats up, the car runs good no codes - I did a tune up, new plugs wires cleaned the throttle body, and a coil -it was arking,

it has a problem when on the highway in fifth gear when you put a load on the motor it feels like the throttle has a dead spot -it will clime in rpms a little the when it hits 2500 rpms it will jump and feel like it wants to take off-it felt like a bad tps sensor -so I tested the voltages and everything is, I even tried a new sensor -no luck- I thought it could be a mas air sensor - same thing -i tested the wiring and even tried the sensor -nope ---so I need help ! Were would you go next?