my car starts but turns off instantly i can un plug the mass air flow and get it to run but like shit. i drove it home with no maf an i got it home and im now tring to get it to run. one thing is the fpr wasn't working at all so i put an after market on but it still dose same thing any ideas ....?

 

any one have an idea?

 

What car do you have, what exactly does the FPR do wrong?

My guess is fuel pump. Use a manual gauge to see if you have enough pressure in the system.

 

also check your vacuum hoses, could have some missing or unplugged. Is there something stuck in the MAF element. Get some MAF cleaner at discount.

 

well it was the o ring on the fuel pump .79 cent fix pretty easy