its a first gen ..... dunno ... got me ... im still learnign bout the 2nd gen that I boutght nearly a year ago...... wish you were near and we could fixer up right and quickly ..... let us know if you figure it out...... wondering if you might be getting some air in the fuel ???? put a clear line between the lift and the IP ( injection pump) and see if while running at high rpm if your getting any air in fuel ..... :humm: