Cracking when starting up in EP 3

Hello people!!! Have been having problems with my CTR for a long time. Every time I start there are funny cracks. The cracking comes defensively from the front. Feel it also a little in the steering wheel! It is always only when driving. Or when I walk off the gas and then step on it again. Was already in the workshop, they found a defective rubber bearing from the engine mount then, but that was not it! Who could help me there?!!