Not sure if that is an L-Jetronic, but I have such a system too. My cold start inj was acting up, and rather than spend more and more time with it, I just unplugged it, and on colder mornings, just crank engine while holding pedal to floor. No problem.
But, do not PUMP pedal- just hold to floor.
Good luck.
But, do not PUMP pedal- just hold to floor.
Good luck.