I just replaced the intake manifold gaskets (leaking coolant) and not too long before that i just put on all new coils. When i went to try it this morning it sounded like it tried to turn over and after a few more tries it started and ran on about 3 or 4 cylinders and then died almost right after. There is an electric motor sounding thing that keeps turning on and going off when i turn the key. The sound is coming from under the engine compartment and i dont think that the fuel pump would be that loud? Also, there is a hissing noise whenever i try to start it and it is coming from arround the area of the uper intake manifold/the back of the engine (top)/ or the throttle body