You could have bad fuel, or something else could be wrong.

for the fuel, change the fuel filter..now. It doesn't matter if you think you did it recently as it's not always a matter of milage or time. I've had to change a filter within a few hundred yards of buying a tank of fuel.

There is always a possibility for receiving bad fuel at the pump. It could have water in it, or be dirty. The best preventative is to only buy fuel at high volume stations that pump a lot of diesel and hence receive new frequently. Even then, if the station tank is low and yours comes from the bottom it could be contaminated.

That your car runs good on the purge product indicates dirty or watered fuel to me.

If you're in a cold climate other bad things can happen to your fuel.

Fuel sitting for a while can begin to grow fungus that will clog filters and systems also.

It's all part of life with diesel and I'd recommend a basic study of the factors involved. The days of simply gassing up without a care are over for you.