Ok I thought i fixed my problem, but didnt. My gsr one day started to sputter and then stall out and die. When i tried to turn the engine over exhaust shot out of my intake. Checked compression everything is fine, new fuel filter, plugs wires, I checked my timing which was changed about 20,000 miles ago and the belt was really loose but valves seemed ok. So I tightened it up and it seem to be running all right till I pulled out of my driveway and then in going down my road it did the same thing. Could the tensioner be broke, no teeth were missing on the belt. Any ideas? could it be something else? No codes are thrown and their is no major engine work. Please Help!