No throttle response

If it a diesel, check to ensure the DEF fluid has been serviced. If you ignore the DEF warning light system will progressively shut down till will not hardly go at all. If a gas engine may be some issue with the electronic throttle control. There are also a few other electronic or mechanical faults that could cause this. Other than filling DEF on diesel and following reset procedures you will need to take it to a qualified shop and have systems evaluated.