After installing an aftermarket radio the truck started to studder while changing gears, from 2nd to 3rd especially. Then after it seemed as if the truck was just running on 2nd gear. I removed the aftermarket and put back the oem radio and the gears are changing normally only thing is that the engine just sounds loud. Also the reversing sensors only work when i first turn the truck on and put it into reverse then after i let my foot off the gas they cut off untilthe truck turns on again. Any thoughts on the situation?