just rebuilt my h23 (spun 2 bearings). everything was put back together and seems fine but it wont stay on. will crank and stay on for a few seconds. if i try to give it gas it dies. smoke is also coming out of the intake manifold (fuel not oil). new plugs, and firing order seems to be correct (1-3-4-2). what could it be? car was sitting for about 6 months while i did the rebuild (have another car so no rush). it had very little gas so i put about 3 gallons in (93). could it be bad gas? id appreciate any suggestions