Hello! My 1999 Buick Lesabre, 3.8l v-6, 189,000 mile car has a check engine light on. I had some major engine work done (hydrolocked engine required new gaskets, seals, plugs, oil change, coolant, etc.) and ever since have had the check engine light on. My feeling is that the shop crossed some vacuum hoses or failed to hook them all up because I have codes: PO440 Vacuum leak at engine PO300 Cylinder misfire (could be a vacuum leak) PO113 Intake air temp (maybe connector is unplugged?) I am going to pop the hood and start rummaging around tonight but I was wondering if anyone had a vacuum hose diagram for the engine specified. This would allow me to back check the connections and take care of this issue. As always, any advice or ideas you have concerning the above issues would be greatly appreciated! Thank you, Jack