Engine lite ON, hard staring, rough idle

I have a 1998 Ford Ranger 3.0 V6 automatic 2 wheel drive 175,000 miles. Driven daily. The check engine lite has been ON for a few weeks and has ran fine until a few days ago. Sometimes when I first start it up, it turns over but doesn't want to start. Once it does start, it runs very rough for a minute or two and then it runs fine. While on the freeway, I can push the accelerator to the floor and there is no hesitation. The engine has new spark plugs and wires, new air filter. Any suggestions?