99 TJ Engine Hard to Start Hot or Cold

I have a '99 Wrangler TJ with 75,000, a 4.0L engine, Manual Trans. It has been hard to start the last two months and seems to be getting worse. It will crank over and usually after about 4-5 seconds it wil start or I have to let off and start cranking again and it will start. It used to start as soon as you turned the key. I have put new spark plugs, plug wires, dist cap and rotor, and I am still having the problem. I would appreciate any help on this problem. I do not want to take it to the dealer. Also, my check engine light is not coming on. Thank you for any help.