Engine Vacuum leak?

You can use the technique in the following guide to help you find the leak and how to fix it unless its a gasket then I will need to send you diagrams for that but we will cross that bridge when we get there.

Here is the guide

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Please let us know what happens.

Cheers

I found where is the leak is on the valve cover and fix that I got the engine code PO171 though is this related?

Yes this code will show up when the engine has a vacuum leak. Here is a guide to clear the code.

https://www.2carpros.com/articles/check-engine-light-clear-codes

Let us know if the codes comes back

Cheers, Ken