88 Legend Stumbles on Acceleration

I just replaced my fuel filter, plugs, wires, distributor and rotor, and pcv valve. When I am going down the road, after driving a while, it will start to "stumble' or miss when I press the gas. The check engine light has come on, but once I restart the car it goes away. After changing out everything, it runs better, but still stumbles.

Could this be fuel injector issues? Or could it be bad gas? I listed to the fuel pump and it was turning on, so I don't think that is the problem, but I could be wrong. If anyone has had any of these problems, please let me know.

Thanks.

have your intake manifold checked. I went through the same procedure only to find my '91 w/100k plus miles had a mostly clogged intake