I'm have problems with starting my 124 spider ...after the cars sits for a few days....I rebuilt the carb and changed the check value....there is fuel going to the car...I just dont know????
If you have spark, air and fuel than it should start, I had a problem with the ignition switch, I replaced it and now it starts all the time everytime. I would check for spark at the plugs, if you do, than I would do the ignition switch.