thanks for the help guys. deffo not a misfire. know what that sounds like.

when I get to 2000rpm its like a metal vibration. like you havent screwed something down properly and its a very high frequency low bassy metal vibration. say you havent screwed a door speaker on properly. that sort of metal to metal vibration.

I got my bro to hold it at 2000rpm or so and I was crawling around the car trying to identify where but thats hopeless since I cant get anywhere underneath. I feel its coming from the exhaust but could well be something in the boot or something. Ive tried things like keeping the bonnet, boot, doors open to see if it gets louder or quieter but nothing really seems to make a difference.

shall have to get it up on the ramps on saturday to have a proper look but the car is going to be warm then and it only does it properly when cold