205 1.4 Cj Fuel Injection Unit Help

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Hi all, can anyone advise of where i am likely to find a good used single point FI unit ?

I replaced my lambda sensor hoping to sure the odd hickup when warm (every now and then the cat light comes on above the fuel guage, and it judders for a bit before the light goes out and is smooth once again) but to no avail. starts great, not too bad on fuel and could be smoother i think, but apart from dumping fuel in when the cat light comes on i would be happy with it.

or can anyone reccomend anyone around the northwest / chester area who would take a look and check it out ?

Cheers