i was doing 30,000 service then the eng. told me that the manifold is cracked he welded the manifold then i went to take the car i found the engine lamp is on then he turned it off with the computer at night i was trying the car the acceleration was worse than before but not awful the i was trying the engine and i did a kick down (dualogic gearbox) the engine lamp turned on but it turned off again !!!! what can i do know?