Hi clif1_98,
Thank you for the donation.
The transmission shifting is controlled by the PCM and replacing the solenoids might not solve the problem.
There is a self-diagnostic system which you can utilise to check for error codes and proceed with rectification.
Engine performance affects the shifting so you need to confirm there is nothing wrong with it.
Check if the throttle is opening fully when accelerator is fully depressed.
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Wednesday, March 24th, 2021 AT 1:47 PM