Miss fire at 2500 RPM

When I am on the highway, around 60-65MPH, the car bucks, or misses. Seems OK unless I step about half way on the throttle. It a 1995 Buick Riv, with 80K miles and 3.8L series II. I have checked codes and I have 3.

Cam sensor, Crank sensor and a missfire code, PO300 random

I know that one sensor is simply to sink the motor, on start up and another is for spark timing, I am just not sure which one is which. I really would rather not replace the wrong sensor/wiring If I don't have to. Or maybe It's not a sensor problem at all, any info will be helpfull.

Thanks

Z

The codes can mean bad sensors or connections, the misfire could be part of this or a bad coil, wire or plugs.