I have a 1994 polaris indy 500 EFI sport. It starts off a little slow and when you floor it, it has like an hesitation to it. I was wondering if the injector was bad or something. I put fuel injection cleaner through 2 separate times but it still has a bog. After 5 1/2 RPMs the bog disappears and it goes fast but when you get near the 5 grand mark it bogs down. Any ideas?