My truck this past week started having issues shifting. The trans acts like it is stuck in 1st gear and will not shift until close to 3200rpm. The minute I let off the gas pedal the truck shifts back into 1st and the process of getting it to shift starts all over again. This has only happened 2 once today and then last Saturday. I have been reading several posts about the apps and the tps and I am not sure could be one of those issues. Any info would greatly help.