Hi all i am getting a problem whenever I try to accelerate I am getting some hesitation on take off and then the car begins to drive smoothly. I changed my aftermarket fuel pressure regulator and put back on the oem one, new k&n filter, new plugs, new fuel pump. What can be the possible cause of this hesitation. I am pushing a citroen vts engine in my ph 3 306. The only thing that came with the engine that I do not recognise is a blue filter like object attached to the vacuum line that heads back to the vacuum pump.

See pics below.

Can anyone assist?

speedo306 has attached the following image:

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RJ

I looke it up here

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RJ