Slow Stang

[PeTr0]

I have had my car for 4 years now. I love to drive it and I will either be burried in it or give it to my son if i have one. The cars looks good and has never given me any problems. I dont want a drag car just yet...my goal has always been to have a mean street machine. Thus I have worked and spend money on looks, sound, and performance. I have the mods listed in my sig and I just added an electric fan. The car hasnt really sped up at all since i bought it completly stock. Of course i take out my speakers and spare when i go to the track. My best time ever was a 14.7 @ 93 mph....but i consitley run 14.9-15.0. I think there is something wrong with the car but it just has never gotten any worse to be diagnosed. I have done almost ever small bolt on money can buy(of course thats impossible for the 5.0) and i want to start with some bigger stuff like heads or a blower. But i dont want to waste any more money. What can i do?? I have heard valve springs could be worn....my buddy had a bent cam dowel pin that made his stang slow....running lean or rich...I dont know