1999 Lincoln Continental. About every 2 weeks The car wont start. I have it checked at a garage and they said all is good. I have noticed the problem while parked on an incline. Seams to start eventually by pumping the gas have also rolled flat and got it to start and banging on the gas tank also. Not sure if i am just getting lucky. She runs great otherwize and I drive it alot 40k per yr.