I have a 4.9l inline 6. I have a new fuel filter and three week old gas in it. A week ago I noticed a loss in power driving and the truck wouldn't shift gears. Then a couple days later the engine would barely turn over and run after turning it on. I noticed a loose bolt connecting the EGR and air was coming out. So I tightened it down and now it seems even worse the engine won't turn over now. Please help I don't know where to begin I have never dealt with vacuum issues.