just can't seem to get the beauty going! i replace every single ignition piece imaginable. she will start up but when she starts it revs up real high then slowly drops and then dies. i have to keep pressing on the gas pedal to keep it going. it isn't the idle adjustment screw cause i turned it as high as it would go and it still would die. do i have a vaccuum leak? she is in time and has a new holley fuel pump. thanks in advance for the help.