Hot running problem

Hello friends, After 14 years of deep sleep, I woke up my father’s old W123 230. Unfortunately, I have the following problem with the car. As soon as he reaches his operating temperature about 85-95 degrees, he starts to stutter & ruckle, barely accept the accelerator pedal and even goes out when you push too much on the accelerator pedal. In idle man notices nothing of the problem, cold he runs perfectly. The following I have replaced that could be related to the problem: -Zündkerzen -Kraftsto fffilter – Krafptstoffpume Just by the way: I put in a lot of work, my goal is to get an H-mark, but the Tüvler meant that with the “typical” cracks in the dashboard, no H-certificate can be issued?! Are you serious? I thank you in advance for your help!!