I have an 03 olds alero 3.4l engine. I have loss of power going up hills,horribl

What is your question?

03 olds alero, replaced upper/lower manifold gasket and since then it doesnt accelerate correctly and loses power and rpms running higher. Does the MAP sensor go bad suddenly or slowly?

What makes this problem better or worse?

More noticeable going up hill.

How long has your 2003 Oldsmobile Alero had this problem?

It got more noticable with every trip i traveled, i dont drive very often. Maybe last 2 months ive taken out maybe 10 times total probably less than 200 miles.