Damn Troubles

Hey guys, my '78 Firebird is having a little trouble getting started. I've had the problem for a while now. The problem is that when you turn the ignition key to fire the engine... it doesn't start. I replaced the battery already and that worked for a while, but she's out again. I feel it might be the alternator or the starter. But I'm not sure. Any advice?

what exactly is happening?

yeah.. no spark? no fuel? its 78 so no fi, so im guessing cant be fuel pump..so..

is it a spark problem? electrical? coil going bad? dist. going bad? starter going bad? alternator going bad?

gotta be one of those, right?