How to fix a leak in my ecu

What is your question?

Ive tried to get this problem fixed multiple times with nothing i dont know what to do that this point i was told there was a leak somewhere in my ecu. Its cause the engine light which is also telling me to check my gas cap. If I drive with it will it hurt my car? They’ve put a new “canister” onto it saying that was bad.

What makes this problem better or worse?

I feel more power when the engine light is not on

How long has your 2006 Buick LaCrosse had this problem?

About 5 months