The noise comes when the engine is warmed up and while the air condition goes on and off automatically; while getting accelerated from idle speed and switching back to idle speed. two new adjuster pulleys have been replaced but the noise is still there. Is that noise harmless or is there a chance to get the drive belt broken again?

I just bought it from a used car lot with no warranty and drove it for one month.

Have had the car for over a year. Starts out good but at times the car seems to loose power. You step on the gas and nothing... then it seems to kick in. If you take your foot off the gas and apply again slowly it will go.

My 2010 Aveo5 has 13000 miles on it and has seen a drop from approximately 26-32 mpg to 20-23 mpg any idea what could be causing this problem? The dealership says they cannot find anything wrong.