I got my truck back from the shop the other day to get an alternator replaced, new oil lines, new oil filter and new fuel filter. Since I got it back, the truck seems to shake and bounce when I change gears (5 speed manual). I know that it is not because I am shifting at too low of RPM's because i've been driving it the same way and it has never done this before. It bounces once I shift from 1500 rpm to about 3000rpm. It's a 1998 4.6 5 speed. Please help!