04black150

I had a rough idle when my truck warmed up. So, i decided to sea-foam and clean the thottle body. The truck runs better and has more get up and go but now my pedals have a slight vibrate in them when in reverse and drive while idling. Plus the idling in general is rougher now. my 04xlt only has 72k on it and is regularly serviced by a local mechanic who keeps up on all area's of the servicing of my truck. Any ideas on this would be great