how do i fix my peugeot 106 look2 1124cc (1998)?

i have a fuel starvaton issue on my pug 106 look 2,, the car refuses to idle comfortably at any time and also has constant flat spots throughout the gears during acceleration,, the instant the vehicle coasts to a junction etc and the brake is applied (foot removed from acc' pedal) the car begins to idle very aggresively then drops down to a shaky stop,, or upon continuing to drive it will kangaroo until it settles down to a regular drive,, where the flat spots are very noticable,, even pumping the accelerator seems not to clear untilm suddenly and for no apparent reason it will begin to drive normally again..
I have been advised to take off the air filter and injector cover and check for sediment and dirt,, which i have done to no avail,, even cleaned the rubber seal and pins on the head of the injector, the fuel filter seems illusive to me ( i cant find it) and i am at a loss,, where should i be starting from to remedy this problem and where would i locate the filter if neccesary