Why does my 2007 Volkswagen G.T.I. not idle correctly when I am sitting still. on 2007 Volkswagen GTI

The tachometer jumps up and down while sitting still, from 10 to 30.

by in Marion, NC on April 02, 2013
2 answers
ANSWER by , April 02, 2013
review when last tuned. may be problem with ignition system. bring to shop for diagnostic to find out for sure.
ANSWER by , April 02, 2013
scan codes to see if there are any then post