My 2001 Sunfire doesnt have the power to back up the hill where we park it.

What is your question?

The gas pump has been checked and is ok. Tank cleaned. O2 sensor changed.

What makes this problem better or worse?

It just doesnt have strength to back up out of basement garage.

How long has your 2001 Pontiac Sunfire had this problem?

It has been there now for about a month.