Hello all,

This will be my first post here so be gentle please, but I have a 2004 Grand Prix GT 3800 Series 3, and the battery died. I bought a new battery, but now when I start it up, the engine "chugs" and the RPMs cycle between ~700-1500 really quick. It does this when I'm driving anywhere above about 40mph as well. On my way home from work today, it stalled out. Could this be an alternator issue since the battery is brand new, or what else could it be?

Thank you in advance.