ok, as most of you know my car would not start for a long time well, we got the car to start an it sounds AWSOME with the new exhaust, but then after a test drive we pulled in the shop an cut it off an it would not start when we turned the key it like hot wired the starter it just kept turnin over. then later it cranked an ran for like 5 mins an shut off out of no where just idling, no skipping or anything just stoped an then it did the starter thing again, this pattern keps repeating...?