Vauxhall Combo Timing?

Hi Wickham,
I will check the timing this weekend. If its out is it a job I can do replacing timing chain? Perkins engines & Cat engines yes - but these electronic little engines are something else! Will I damage the engine running it with this misfire as I cant afford being off work & I cant afford garage prices.
The van runs sweet as a nut over 2000 rpm.
Tel no. is 01691 829290. I will moither you again this weekend! Many Thanks, Tony.