problem with car stalling

I have a 1991- 750 IL BMW and when driving it, it acts like it wants to stall as if there is no gas in the car. It goes very slow as if it will give out of gas at anytime, but there is gas in in and i have recently replaced the fuel pumps on the car. Anyone have any ideal what this could be? Thanks

If it hasn't been done, you might need to change the fuel filter. The filter is dated, so you can clearly see its age.

Thanks Chris, i have changed the fuel filter.

Check engine light on? You might want to check the stomp test as described in the PDF attached.
MAF sensor could do that or vacuum leak. Fuel pressure regulator also.
I would test for vacuum leak first, fuel pressure regulator, and then MAF. Clean it or try to run engine with MAF disconnected.