i just bought a 92 ranger super from my brother about a week ago. it has the 4.0 motor. the truck sat for about a year, my brother got the truck and found that it was having oil pressure problems. the truck can sit on an idle and be fine all day, as soon as you hit the gas the pressure drops way to low to keep with the engine. im not sure what it might be, im going to start at the pump and work my way p from there. any advice is appriciated