Hi Luxobarge, Many thanks yet again for your advices. A couple of years ago I had a period when my car was backfiring and that was found to be a split in a hose. The cat fitted is aftermarket off flee bay and has been on the car about 3 years. When starting the revs go to about 2500 for a second and then drop to 800 but tick-over is not smooth. From what the guys have said I could well have another leak or the cat is on its way out. Cataclean could well be "masking" the problem as you suggest.
I shall get my mechanic to give the hoses and clips another good look.
Thanks to all you guys for your advice. jack
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