could anyone tell me what’s up? its a combo 1.7D when i doing about 30mph the engine stutters abit and then goes fine, doesn’t happen all the time but is getting annoying .thanks

A focus I had did something similar when the Air Con was on. As the air con kicked in and out there was a slight hesitation, but it didn’t necessarily happen at the same RPM though. Does it have A/C and if so does it still do it with the A/C off?

Maybe try some of that fuel additive to clean your injectors, maybe ones picked up some dirt and isn’t atomising the fuel properly at that RPM.

Could it be a tank of dodgy diesel?

Failing that maybe try a local garage to hook up a diagnostic unit to see if that throws anything up.