I am getting a low idle issue on my '99 Sierra 5.3L w/109k miles. It normally idles ~700RPM, but is not sporadically idling at 300 RPM which is causing it to stall. What things should I be looking at as a possible cause. Nothing has been changed in the motor except the plugs which I changed 10k miles ago.
Thanks in Advance,
-a12vman