1989 Ford F-150

Thanks for your prompt response. The service attendant tells me "the mechanic checked it out." He says "a pressure test probably revealed poor pressure." Since the truck got a new front gas tank six months ago, I early on asked if there was the possiblity of dirt in the tank. The answer was "highly unlikely." I aksed about the gas line filter. Answer "we are going to change that too while we are at it." They want to change the miidship fulel pump and the high pressure fuel pump at the same time. The truck has a rear gas tank which I have not used for a while since I ignored a recall notice for a faulty switch. The switch is now replaced so when the truck died this past time, I switched the tank from front to rear and there was no difference. The noise is a hissing noise. It sounds a lot like air pressure. The noise is sporadic as the engine chokes, coughs and usually just dies. If you pump the gas pedal, sometimes the truck seems like it wants to run and sometimes it just cuts right off. You can't make it start unless it sits for about 15 minutes. Then it will start but only run a few minutes until it gets warmed up again. When its cold it runs fine. I just find it hard to believe that a fuel pump (or in this case 2 ) reacts to temperature. My brother-in-law has been a mechanic for about 25 years. He thinks it's a coil. I asked the dealer, the response was not likely. I bougt a coil for $20.00. Even I can replace it. Since everything but the coil was just replaced, why not replace it in any case. My brother-in-law thinks it's an electronic problem of some sort in any case. A major computor module was also replaced, so it's not that, but there is another computerized component attached to the distributor that he thinks could also be the problem. Thanks again, what do you think?