Peugeot 406 Coupe engine suspension – I’m getting bugged.Please help!!!

Hello everyone, I drive a Peugeot 406 Coupe petrol 2.0 16V. Driving Zeu Idnt.No.: VF38CRFVE80405366 Year of manufacture 1997 I have the following problem that car makes an engine suspension while driving, sometimes it goes out completely, sometimes I have to give gas a few times and then he drives on. The company has made a diagnosis about the car, unfortunately she found nothing, 0 mistakes and I was off 55€. Then a car master continued to examine the car and unfortunately found nothing. h advise that it could be the petrol pump, which I replaced afterwards and then came the surprising result that car has not made a dropout about 50-60 kilometers.After a break of an hour I then drove on and stupidly after a few kilometers the dropout can again.That almost made me cry!!! I have read your asked questions and answers about the similar problem for hours and I have noticed that there are different reasons for It is interesting that a gentleman has written here in the forum that his friend has changed a “low pressure regulator” and so that problem would be raised. My question can help me? And who knows where the low pressure regulator is and if this can really be a problem. I thank you in advance for all the rest strokes of nice people who want to help me share your own experiences. n and of course for all advice from professionals.