so i had my 99 gt tuned for a supercharged application put down pretty good numbers. But right around 5000 grand it will starting bucking. it will not let me go above that, i need to shift. I was told its most likely spark blow out. Im running NGK tr6's the only problem is i dont remember what I gaped them at. Also at high rpms the battery light will come on, but as i let of it will turn off? Any ideas?

 

Battery light is probably indication your alt is failing
Bucking is most likely fuel starvation