Engine hesitation with AC on

The fact the problem seems to be related to the a/c system in reality is the a/c is simply making the rough idle more pronounced due to added engine load - rough idle / hesitation problem is still there with a/c off - it’s just not as noticeable. https://repairpal.com/repair-shops Good luck!

Attempting any repair based on a trouble code alone can be a waste of time. For instance P0455 CHEVROLET *Possible* Causes: Missing or loose fuel cap Incorrect fuel filler cap used Fuel filler cap remains open or fails to close Foreign matter caught in fuel filler cap **EVAP canister or fuel tank leaks **EVAP system hose leaking **Fuel tank leaking In all likelihood the PO455 will return.