I have a 98 ply grand voyager with a 3.3l and flex fuel. It will start and run fine until I take the highway then it will lose power the harder you push on the accelerator and eventually stall and will not start for a couple of days. Let it sit for that period of time and it will start and be fine again. It keeps doing it every few days. I also noticed I'm getting air in my fuel rail but has no gas leaks.Any info is greatly appreciated.

 

possible fuel pump whats the pressure at the rail head?

 

the fuel pressure at the rail head is 20