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Message: <blockquote data-quote="moots" data-source="post: 23375" data-attributes="member: 219"><p>symptom : at idle the engine misses a beat approx every 15-20 seconds.the sound can be heard from the exhaust note and noticeable with the tachometer dropping about 100rpm but recovering straight away to steady idle at 750rpm.if gear in D,the car will jerk everytime this happens and very annoying at traffic lights and traffic jams.when cruising no jerk. solution : i am lucky to have friends who change stuff due to "trial and error" recommendation from their mechanics .in this case i was given(for free) 6 'suspect' ignition coils,which i know for sure is good.so i replaced the coils starting from the #1 position - no change.2nd coil - voila.....smooth idle. cost - 1 hour and 0 rm   so bad ignition coils can cause lumpy idle...also bad cam pos sensor,bad crank pos sensor,bad plugs,bad etc etc.....you know the drill</p></blockquote><p></p>