Hi there,
I have an '05 grand prix (base) with the 3.8 Vs (natural aspiration) with 217k that won't start. Last Friday (4/9/16), while my brother was borrowing my car, the battery got drained, but not fully drained, just enough to keep the starter from engaging but still enough to kick on the fuel pump. It was fail started SEVERAL times and it got flood(naturally). After a buddy and I got her running it sounded like a damn go-kart, so we took it to his place, changed the plugs,wires, and oil and she continued to run rough (making a rapid put sound from approximately the general location of the cat). Figured it still had unburned gas pooled in the cat so I rolled the dice and figured it would sort itself out, which after a few days it started idling smoother and was getting pep back into its step. Come Thursday night when I went to leave for work, damn thing wouldn't start. Plugs and wires are all seated/gapped properly, brand new battery with a charge, fuel pump is coming on and the starter is engaging, its trying to turn over but it just won't fire. I'm at a complete loss here so any insight is greatly appreciated.