HI NEW TO THIS, RUNING V8 3.9 IN MY KIT CAR ENGINE BUILT BY RPI ENGINERING IN NORTHFORK RUNING A WEBER 500 CARB AND A MALLORY DUAL POINT DISY, WITH ENGINE ALL SET UP ON TIMMING MARKS CAR RUNS SOUND LOW DOWN AND STARTS PERFECT BUT OPEN THROTLE OVER 3000 REVS IT STARTS SPLUTERING AND BACK FIRING BUT IF I ADVANCE THE DISY ABOUT AN INCH OFF TIMMING MARK THE CAR RUNS EVEN BETTER I GET TOP END POWER BACK STARTS OK WHEN WARM, BUT IN MORNING AT THIS SETTING CAR CRANKS OVER FOR AGES BEFORE START CAN ANY ONE HELP.THANKS.