my 1988 Ford F-250 has a recurring stalling problem. It is fuel related. I have replaced the fuel filter and H.P. pump, the stalling quit for two days. Now the problem is back. What is going on? 302, TBI,two tanks, auto trans. HELP!P.S. the truck starts normally and drives normally for the first 15 minutes of my morning and evening commute then its like running out of gas, open the throttle it stalls quicker. The truck will restart after cycling the ignition switch 6-12 times. Then its driving normally again.