Why is my car going so slow on acceleration. It won’t go ast 40 mph RPM UP TO 2k

What is your question?

I have replaced the CVT transmission certified by a mechanic to be functioning properly I have replaced the transmission control system I have taken all the wiring harness and Plug’s off and Die electrical grease on all the plugs and wires got into the PCM auntie T.m to make sure there’s no internal Damage or corrosion the battery power is sufficient to run the car and the alternator is doing its job and I checked all the currents and prongs and fuse box and I cannot find the answer. Please help I have so much invested and I’m runing out of options money and time. The car is a 2.4 Jeep Compass 2010 4x4

What makes this problem better or worse?

I made sure all the tires are the same and had a flashing done and it went from 15 to 40 mph

How long has your 2010 Jeep Compass had this problem?

1 year