i recently bought an older indy 400 for my wife. the sled ran well but was low on compression. i punched the cyl. .20 over and rebuilt the lower end. now the motor starts on second pull, but once running, the sled will just die, and be hard to start back up again. i have ran it good on thte lake and it seems to go great, but while idleing, it just seems like it loses something and just dies, no stopping it. any input will be great.