When I say it was flowing out it is not normal at the amount of air flow. It started to stumble when driving off and runs rough. I have max injector quantities on all injectors 3.00, -2.99, 3.01, -3.00. I did have a serpentine belt break on it a few months back but I replaced it and didn't have issues with it until recently when it died on the interstate gettiing off at an exit. After that I replaced the fuel filter( it was literally all black) and checked the air filter which was clean. Thinking I should start with injector seals??(maybe leaking exhaust back into the crankcase if that is a possible)? Just need some ideas to get this back on the road. It does have approx 283,000 miles.