My engine sounds like itis not getting enough power to keep it going. on 1999 Chevrolet Venture

There is no diagnostic code. The tests thst were done show no electrical problem. None of the warning lights on the dashboard come on. It only cut off once and was easly turned back on again. No service light comes on, so I was wondering if it could be the feul pump or water pump?

Asked by for the 1999 Chevrolet Venture
I would start with having the air filter changed and replacing the spark plugs to see if there is improvement in performance before going any farther and you can get prices here and locate shops near you here