So whats the problem like in more detail and how frequent? if the imrc is functioning as it should the other common issue is the fuel pump.

My mrs drives ours daily and every now and then comes home complaining its running rough and she's had to mash it into the floor to get it to shift anywhere near how it should. I take it out straight after and buzz it round the local bypass, it pulls as it should and flys. Essentially her problem is that she comes straight out of work into traffic and kind of chokes it up. She also complains that it bogs down, its when she doesn't use enough revs though usually.

Only time i've had a problem is when i've used shit fuel as mention earlier and it wouldn't even move at low speed.