It could be a couple different things but, I always tell people to check your gas cap first. This is an evaporative emission problem and the system is not holding a vacuum due to a gas cap not tight, etc.
You can run a diagnostic test for the knock sensor, on your 2005 Chevy avalanche, by hooking the engine up to a diagnostic tester.
2.2L eco-tec
P0496= evaporative emission system High purge flow
unskew the bolts
Mine was a disconnected cable to the charcoal filter near the gas tank.
where is diagnostic link connector for Honda odyssey 2005
Trouble code P0142 means:O2 sensor circuit malfunction (Bank 1 Sensor 3)
Sounds like its from one side? Ur shocks
i had the same thing happen to me and simply had it hooked up to a diagnostic and reset the codes and it fixed it apparently a sensor had malfuntioned and was not communicating with the computer
when to tune up my 2005 chevy
where is the bcm located on a 2005 chevy cobalt
where is the bcm located on a 2005 chevy cobalt