not had this a4 long when it started intermittently being down on power lower in the revs. i fault code read it when i first got the car (seemed to be running fine) and it had a cam hall sensor fault in it but it cleared and i thought no more about it. now its down on power below 3krpm. you can drive around it by not flooring it. like if your holding a constant speed but accelarating by putting just a tiny bit more throttle on. but if you floor it or go too much throttle it seems to drop power in an obvious step kinda way, if you know what i mean? above 3k tho its very sprightly, seems to have plenty of grunt on motorways easily holding 80+ uphill. with it running you cant clear the "cam hall sensor - no signal" fault. you can clear it without the engine running but start it up and its back again. the engine man light isnt on. ive checked the timing and thats fine, the cam sensor has 5v and a ground. ive yet to take the car to work to scope it up. if it has got a signal coming out, i'll check the continuity of the signal wire back to the ecu. see if that throws up anything. or do you guys think the power problem could be something else? throttle position sensor? map sensor dirty?