I would have a check around the engine for vacuum pipes that may have come off or have a hole in them. Then maybe air filter and clean the related sensors in the air intake etc.

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A dirty throttle body certainly used to cause my 1994 3.2 to drop to a very low idle, briefly, when I stopped in traffic. I was always worried it would stall. Cleaning the throttle body opening and all the air intake pipes cured it. Worth a shot, would also be a good opportunity to check the condition of the vacuum pipes as Roly suggested. Hope you get it sorted.

Thanks for all the replies. I have changed the fuel filter already. I've asked the garage to clean the throttle body and check for any vaccuum leaks. The air filter is an after market K&N that was on when I bought the car last year, it still looks quite new, so should not need cleaning. I really hope they can fix this, the garage owner seems convinced there is no problem, which is frustrating as I know there is and I don't want the car back without it being fixed. Any more ideas are welcome.

Had the car back from the garage, they say they have done the throttle body and it is fixed. I have been on a short 5 mile test drive and all was well, so hope it will be ok from now on.  Many thanks for all the friendly help and advice, this is a great forum btw.

I have driven about 40 miles in the car now since it reurned from the garage and the problem has not reccured. However, as it was intermittent before, I won't have full confidence until i've done a few hundred miles more. Apprarently the garage cleaned the throttle body, the MAF and checked the connections to some of the sensors, so I guess any one of those things may have been the fix. Although, it is running ok now, I have noticed that when coming to a stop at a junction the revs dip lower than they used to, like I say I am not totally confident the problem has been sorted.
I have noticed that the earth strap to the bonnet has completely frayed through and also teh earth from the engin to the body looks very frayed and weak, could a bad erath cause the intermittent cutting out? Also, could this be the cause of my heater being intermittent blowing hot?

During reading this post you said the garage cleaned the throttle body, bet they did not remove the ISCV valve and clean it or ensure the TPS sensor was removed and cleaned with contact clean, the TPS is not water proof i found out the hard way when cleaning my throttle body, as you have stated that the revs are now lower, can i make a suggestion, clear pipes away from the ISCV valve and remove the 2 screws that hold it in place, DO NOT TURN ON THE IGNITION, remove and clean with clutch and brake cleaner to break down any carbon deposits, do this several times to clean the internal workings, clean the seat that is in the body use Q tips to get in there, it may sound like an over kill but time spent hear will work.
Reassemble to body reconnect harness clean contacts first and try, it will have cost you £4-00 for the cleaner and 1 hours time.