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itermittent idle and bucking at 13/4 bar boost.

Fuel System

Model: 944 turbo, Year:1986, Mileage:71,500, Type of use:Street use only
last spring after the winter the car started sputtering. ran all the gas down, went thru a couple of tanks of gas. seemed to get a little better. cleaned the plugs. Same thing this year. I replaced the two crank position sensors at the back . took the 3 bar fuel pressure reg. from my race car and tried it also. replaced the dist. rotor , coil. fuel filter. still at idle it is intermittent .putt,putt,then smoothes out to a MMMMMMMMM. has great acceleration until it gets to 1 3/4 bar of boost then it starts bucking and missing. almost like it needs more fuel or the knock sensor is kicking in. any suggestions.

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