Tighten Gas Cap and Check Engine Lights
Wanted to share my recent experience.
2008 Impala SS started surging slightly at cruising speeds. I cleaned the MAF sensor. Nothing changed. The next day I get a message on the dash to Tighten Gas Cap. It wasn't loose. That afternoon the Check Engine light appeared. I double checked to make sure my hoses were reconnected properly to the air intake tube. Check. I then discovered that my remote starter (from the factory) was no longer working. Hmmm. I took it to my local Auto Zone and got the diagnostic codes of P0455 and P0121. I then took the intake hose back off the throttle body housing and sprayed TB cleaner in there while wiping out what I could with a rag. I fired up the engine (after some extra cranks to clean the cleaner out of the intake), cruised two miles down the road and the check engine light disappeared, no more message to tighten gas cap, no more surging, and the remote starter now works. Unbelievable.
I think my K&N affects this more than a paper filter would. I suspect the oils from the filter cause faster buildup on the sensing elements of the intake.