I own a 1972 3.0CSi, lately when accelerating the car sometimes hessitates, and during idle the rmps drops low and the car starts to surge and then cuts off,when you restart the car it idles up & down, the dist cap and rotor are new ,the spark plugs are new, i installed the petronix ignitor last year,it's been working ,i've raised the idle and moved the dist,and no changed can anyone advise me of what could be the problem, D-jet computer ???