My 90 Tracker can be hard to start after it sits for 10 minutes or so. Today I drove it home 30 miles and stopped at Target. 10 minutes later when I tried to start it it almost caught, but not quite. Then it would crank and crank the next 4 times I tried to start it. After that it started with a little coaxing. When it is cold it always fires up instantly. It has done this before. Any ideas?