Astro hard start when cold.

I have a 95 chevy astro that has a starting issue when cold, has to be turned over 5-6 times before starting. It also is sluggish under heavy acceleration. I have replaced plugs, rotor, plug wires, distributor, egr valve, oxygen sensor, catalytic converter. It also will not pass emissions control, ouch. Anyone have any idea or fixes. Thank you in advance for any suggestions. :banghead: