Originally Posted by Stretch

If you're suggesting that the shut down valve on the IP operates at high crank case pressures then I think that's a myth Barry - I'm still trying to figure out a way to bust it though!

http://www.peachparts.com/shopforum/diesel-discussion/332890-searching-data-official-limits-maximum-crank-case-pressure-om617.html

It seems to me that high crank case pressure is as equally likely to blow out a seal as it is to stall the engine at idle. I've yet to find any suggestion / evidence that high crank case pressure at engine speeds higher than idle speeds causes this kind of trouble.

Please note I'm not saying to not check to make sure that the crankcase ventilation system is working correctly - that's very good advice; I just don't think it'll cause engine stuttering under acceleration. In that situation I reckon high crankcase pressure will more likely blow a seal...

...but again I have no way of proving this theory of mine just yet (but I'm working on it in a part time when I get the time kind of a way!).