Driving down the interstate at approx 65 mph, i give the car some gas to pass a vehicle and car loses all pressure and starts to stall out. We get it over to side ot the road, vehicle is towed to shop and mechanic says engine is going. The car would turn over but would not start and there was more oil in head than there should have been according to mechanic. Told it could be a timing belt, oil pump etc. Does anybody have any tips?