Thanks David,

I didn't know it had adjustable tappits, but sure enough it turns out that they should be checked every 25000 miles. I'll take a look.

Peter
I think 250mb equals 22.5inhg which seems like a good manifold vacuum, maybe too good! Autodata pin out info says map sensor at idle 1.2 volts. Map sensor on this car is 0.85 volts at idle. I haven't tried it on the gas analyser, however short term and long term fuel trim at idle is perfect. I have a look at the gases.
Thanks

Alan