My friend has a 1991 GT Convert with only 36000 miles on the bottom end, and he put on the holley system Max kit, along with 75 mm mass 24 lb injectors and so on. While driving the oil pressure is about 25 to 30 lbs, but when he stops it goes to 0. The check engine lights comes on and goes off every now and then. The pressure jumps up as soon as you touch the gas. What could it be? I hope its not a spun bearing or anything. Thanks