car won't stay running on 1999 Pontiac Grand Am

what is the fuel pressure suppose to be

Asked by for the 1999 Pontiac Grand Am
If the car starts the fuel pump must be putting out some fuel pressure or pretty close to the pressure required, could you have a vacuum leak? Has the engine run rough recently or has the Check Engine Light/Service Engine Soon light come on?
Hi Mr. Patrick, hey I have the same exact problem with my 99 grand marquis and yes my check engine light goes on/off every other week or so. First, the "box" that opens&closed when a/c is on&off would make a bangin noise when i turn the a/c on.After a got that "box" replaced, every time I stopped at a stop light I had to make sure I held the brakes because if not the car would jump like it was trying to drive itself. Turn the a/c off and it stops jumping. Now it does that jump thing every blue moon but getting it to stay crunk after it has sat for 5-6hrs. is my new big problem. I changed the mass air flow sensor but it didn't help. Can you?
2 answers 1 comment
aprox. 38- 42 psi