Need help to find a new problem. Just replaced the water pump and after a few mintues of driving the CEL was on. Went back to the shop and they denied doing anything that could cause the light to go on. They turned it off and after about 10 miles it is back. the code is for "manifold absolute pressure sensor........" and I don't know where it is located and how I can check it. I search the site and I didn't find any discussion about it. Any help will be appriciated.