Ferrari 308 difficult start-up Hot & cold

Dear all

My name is Niklas Walentin, I'm 20 years old and the proud owner of a euro 308 GTB from 1978. The car is in excellent shape, two owners from new and with 82000 km on the clock.

Before I got it had just had big service done, inc. replacement of Weber carbs, so everything should be ready to go. I just had carbs retuned at the official Ferrari Dealership and Service here in Copenhagen, Denmark and she spins amazing.

BUT !

I have problems starting the car from time to time in cold and now also in hot.

COLD : The car has been sitting for 10-14 days, doesn't start in first attempt (30 sec with fuel pump until it makes a curtain noise, full choke). 2 attempt doesn't start as well, I try to help it with pumping the gas pedal a bit. 3 attempt, its almost there just about to start, pump it until starts, But it start with a huge rev up to 6000 and then slowly goes down during 10 sec to 1500 rpm.

Now, am I just being a young impatient ignorant or is there something wrong ?

WARM: The car has always been starting perfectly, but now today after sitting for 10-14 days, when I wanted to start, 5 sec of fuel pump and turn the ignition on it kind of "blocks" the ignition. There comes a weird ugly "warning-alike" noise. I kept trying a couple of times but gave up and left it for a minute. Then tried again with half chocke and then the ignition when on at the car fired right up . Just have to say that the car had been driving for 15 minutes before I shut if of first time .!

I look very much forward to hear from all you with more 308 and general Ferrari experience than me and hopefully with advices i can give on to my mechanic

Thanks,
Niklas Walentin
Copenhagen, Denmark