well although i.ve said leads. That wasn't my only trouble. Started hesitatin at 4k at .8. Checked leads n plugs. Cleaned plugs n was fine. Boost to .9 n it started again. Changed leads, plugs were fine. Sorted it. Boost to a bar. Did it again. Changed dizzy n rotor arm. Was fine. Boost to 1.1 is fine. Boost to 1.2 clutch slips. So rollin at a bar till new clutch. Safe