I have a 99 ford f150. Been a good truck, but have a problem. When I park in my driveway, which is on an incline, facing uphill, it clicks 1 time when I turn the key. I back down the driveway and it fires right up. It starts everywhere else in the world except there. I can't figure that out. I park in the back yard, facing uphill, and it will start, but not in the driveway for some reason. What are your thoughts on this?