My dang 99 Contour wont start. It pisses me off. It did this yesterday and now it is doing it today. It worked fine all day until then yesterday, and it worked fine all morning. I have no clue what the heck is wrong with it. Any help?

Tony

1999 Contour SE 2.0L VCT
Mods:
*BFGoodrich P195/65R14
*Pioneer 3100 Cd player
*Pioneer 6'x8' 3-ways
*2 12' Super Blue Subs
*Pyramid 400 Watt Amp
*Yellow Fog Lights
*Magnaflow Exhaust #14822