Subaro no longer accepts gas

Hello together, I need a lot of competent support! My Forester SHD 147PS has the following problem: During the ride he does not take any more gas in irregularly and the engine turns down. When I then uncouple and turn back into a gear he comes and also takes the gas again. This symtomatic now occurs more often! There is no entry in the memory! What has already been done: My dealer has gone through the car and came with the diagnosis that can be done at the Klimaanla -New condenser – climate ok – problem remained In addition, I had already done the following: -Air and oil filters were exchanged -LMM checked -fuel line checked In the following there was no improvement, the problem remained! Then the motor lamp and ESP went on. In the malfunction memory was an entry with reference to the glow plugs in it! -Glühkerzen changed and then all was ok for a while until the symtomatics went off again. After some Re. I found out that another subaro driver had similar problems. He changed the accelerator pedal. Here was probably the fault due to a defective poti! I got a gas pedal and try that too. I can’t believe it yet. Does anyone have another idea? Thanks in advance. LG Andreas