Coco is right, if you have not ignited the \ "Check Engine \" do not look for damaged electronic components, it can be sympleously that the deposit makes you empty when the ventilation is stuck.
Another thing that can give you failures is filter and gasoline pump, but I suppose that having changed pressure regulator checking the circuit pressure was not going too low.
You must also check the airpiration tubes of the car, and vacuum hoses, because it is possible that it is taking air without the switchboard finding out, so that it injected less than normal to the point that it almost stops, when the switchboard detects that the engine turns too slow or that there is a mixture too poor in fuel, injecting sudden Apart from giving a few hell when you circulate with the car.
All the best.