Hello, my sons 99 4.6, borla exhaust/h pipe only mods, wouldn't start last winter, which its not driven much then. Narrowed down after it ran fine all summer it will not start around 40 degrees F or below, the garage warmed to 54 last friday and it started fine,Sunday 41 degrees no start. Why/what does 40F have to do with it? Not showing any codes. Pumping pedal changes nothing, I am at wits end, move to Florida, car would run fine.