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Hi guys, right ive spent a week googling stuff but no luck. Got an 03 318ci coupe 38000 miles, and it idles ruff SUMTIMES, i would say maybe 2out 5 times when u come to a standstill, the revs hold steady but the engine becomes ruff and car shakes very slightly and u can feel it thru wheel, seen loads of posts on persistant ruff idle but not anything like this. Ive replaced the plugs, cleaned the maf yesterday with proper crc stuff.stil got it,throttle response feels better after maf clean though. Just wondered what to try next, clean icv? Had bmw check out the car last week, the readings on cylinder 1 were slightly higher than the other cylinders, he said prob be a bad coil, could that cause it? Coil no4 went last week and it misfired like mad.so swoped and all was fine.
Also when i knock it into reverse, i get a load beep for 3secnds and it doesnt work wen im reversing, obveously a bad sensor but anyone know if i can find out which one to be exact and how do u swop them?
 
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