Well I have posted a couple times, and seen posted more times then I can count about sparatic hard starting. My car had this too.
Well its at edmonton motors and a Vette "specialist" was looking at it doing compretion tests etc, and found that it was a bad EGR that was causing the hard start.
They replaced this and it no longer has any starting problems at all.
Just though I would share how it was fixed on my car, and maybe help someone else.