[jbg]

Hello Aidan,

It certainly is possible for your injection pump belt to have stretched -- or slipped a cog. Typically the most subtle of changes in timing result in noticeable operating characteristics. Naturally the definitive way to confirm your assertion is to check the pump timing.

I've experienced some of these symptoms before from a clogging fuel filter -- a different make and model, but it was a diesel; something to consider.