I replaced the plugs and a few bad coil packs. The trucks starts right up and idles perfect. When I go to drive it, it takes right off,(no slippage), but it doesn't want to up shift unless I pump the gas peddle. PLEASE HELP. I also cleaned the throttle body and MAF sensor, and cleaned up the battery posts. Any ideas anyone? I need my truck badly

 

I am not as familiar with the electronic control system on the drive by wire vehicles, but that sounds like a throttle position sensor issue.

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