I have this problem that is worrying me. Whenever I start the car from cold the engine (2.7 V6) races up to over 2000 RPM in a split second then drops back to a sensible tickover around 1000 RPM.\nIn its initial spurt I can hear what I think is a bearing knock before the oil pressure has built up. It only lasts a couple of seconds at most.\nI was always taught the you should never rev a cold engine and better still you should let it warm up a bit before moving off.\n\nMy question is, what can be done to prevent this revving which I think is harming the engine? I expect it to start and run at 1000-1100 RPM at the absolute maximum when cold. \nIn addition to this when I so much as breathe on the accelerator pedal it's sets off like a rocket but then calms down. \nOnce it has warmed up it behaves normally.