what would cause the speedometer to quit
while driving my 2006 cobalt my speedometer will quit working and it sounds like its gonna stall.but if you mash the throttle to the 7000 redline it will seem to move .if you stop and restart everything is ok again the vss on my scan tool reads 0mph evn if im doing 30 mph im thinking it may be the output speed sensor on the transmission or even a faulty key switch even though i have no dtc . any suggestions or hints?