My mother-in-law has big problems with her 1996 Astra. A couple of months back the woodruff key in the crankshaft timing pulley wore and sent all the timing up the wall.

After fitting a new pulley and key, everything was fine for a couple of weeks, then the car started to run really really hot, to the point where a short journey to the local shops would start the fan off at around 100 degrees.

Since this the car has lacked power when accelerating, but revs fine when stationary!

I checked pretty much everything I can think of, but drawn a blank! One thing I did notice, however, was a large pool of oil in the MAF sensor, which I presume shouldnt be there.