Losing gas power while still on pedal and 3 to 4th gear starts to grind when hot

Hi, my name is Devin. I am an auto repair expert with the Car Genius team here at RepairPal. So sorry to hear you're having trouble with your vehicle. Losing power while pressing the gas pedal and experiencing grinding in 3rd to 4th gear, especially when things heat up, is concerning. The combination of these two concerns makes it sound to me like you may have a stretched shifter cable that is not allowing you to engage gears fully. The grinding could also be caused by damaged synchronizers in the transmission. I recommend inspecting your shifter cables and draining the transmission fluid to inspect for metal particulate. If you need more advice, have any other questions about your vehicle, or would like to get connected to a RepairPal Certified shop near you, we have you covered. Give us a call at 877-913-1554, and we will happily help you out!