Right guys can you help me. I've bought another puma in much better condition than the last one but its got a problem. When cold or for first 15 mins of journey it's fine then all of a sudden low on power up to 3000 rpm then pulls better. When this happens there is a very loud induction noise from airborne. It's been serviced regular, just had new HT leads, coil and plugs with correct gap set. TPS checked readings good. Haven't had a diagnostic but looking on the net and thus has happened to a few but nobody had posted the solution. Ring any bells with anyone??? Cheers.