Why would my 2011 aveo die once you give it gas. It like back pressures.

What is your question?

When you start it it will run till the rpms get to the 3. I've replaced fuel pump, crank sencers, fuel pump, checked hoses, everything I think except replace the computer. Help me. 2011 aveo. Nice car though.

What makes this problem better or worse?

It won't stay running long enough to warm it up.

How long has your 2011 Chevrolet Aveo had this problem?

Since I bought it a week ago.