Just had my water pump and intake manifold changed and a whopping cost of 1,200. on 2003 Chevrolet Venture

Now my car is vibrating and acting like its going to die when I stop at red lights or drive thrus and the mechanic says its nothing they did. What could be wrong?

Asked by for the 2003 Chevrolet Venture
1 answer
Was it running that way before the work was done, sounds pretty fishy to me.