hi, i have a 1990 j plate t4 2.4. I have the most annoying droaning noise from in the cab. When sitting at idle and you rev it its present. The noise isnt present from under the bonnet. it is like a vibration being applified. I have replaced cylinder head, fuel pump, injectors, engine mounts both sides not the rubber one under neath. all parts are brand new from vw and the timing and valve timing is perfect. i have tried foam all round the engine etc. still no cure. all the exhaust mountings etc are ok. HELP!!!