Monday, August 29th, 2011 AT 11:58 PM
I went to Advance Auto to get them to read my check engine light and they told me the codes were a misfire and for a speed sensor. I changed my spark plugs and coils and also the speed sensor, but my car still idles very rough. Sometimes it will idle great, other times it will be very rough and my RPMs will constantly be moving while I'm sitting. Any ideas on what else it could be?