[z28 justin]

I'm sort of at a loss here. My 95 Z28 has always given me some trouble starting, sometimes gotta try twice, but now it's getting somewhat out of hand. The engine just cranks and cranks and cranks, but will not kick over. Once it does kick over it runs fine, but it just takes forever to get it. Sometimes it'll surge a little, sometimes it doesn't, sometimes it'll give me a little puff of blue smoke if I step on the throttle while trying to start it. I read somewhere that it could be bad injectors. Can the starter just be getting weaker? Engine has LT4 top end with an aftermarket cam, so is it just not spinning fast enough? Any thoughts would be helpful, thanks