I have a 95 Bronco with a 351..for about a year now every once in a while she'll start rough and barely hold on and then it seem to be fine. She's even started rough, stalled and won't start till a 1/2 hr later. Had it to the mehanic and of course she was not acting up at that time so they just hanged the fuel filter. I think it's a relay, sensor or pump problem. Any idea's. Thanks