Bucking/Jerking Issue (driveline related)

[hooken m]

whats up guys, so i haven't been able to figure this problem out. car is a 91 325i. when im at lower rpms 1500-3000(maybe even 3500) the car bucks when as soon as i get off or on the throttle, just for a second. its not a constant buck, just an initial buck. happens almost all the time when im at lower rpms.

engine and trans mounts are brand new poly
guibo and CSB looked good to me when i checked a few weeks back.
diff mount is new as well, but oem rubber.

any and all help is appreciated

[Balleristic31]

Fuel delivery issue or distributor cap

[hooken m]

Fuel delivery issue or distributor cap

distributor cap is good

car is on stock injector, but im having a set of 17lb injector rebuilt and i'll be swapping out the fuel filter at the same time, so im hoping that will really help solve the issue, other than fueling or distributor cap, any thoughts? thanks for the help thus far

also, fuel pumps dont make any whining sounds, so i dont believe they are on their way out