Misfiring issues?

have a 1996 chevy 10 4.3 throttle body and it has random misfires during steady driving. During idle and accelerating it oesn't miss but it doesn't do it every time while driving.The check engine light flashes every once in awhile. The first time it flashed i got it check out and it was the Mass Air Flow Sensor. So I changed it and today the same thing come up again. I have changed Plugs, cleaned throttle body, clean distributor. The only thing I haven't done is replaced the plug wires and the distributor and rotor. plz someone help me and don't say take it to a mechanic either because if i can't learn how to fix it then it doesn't matter.Misfiring issues?
Jed--

The FIRST place to look for a mis-fire is the secondary ignition. Check the plugs and the wires.

Give the cap a good look as well (but less likely than the wires and plugs)

What were the codes you retrieved? Any others besides the P0300?

There are other things that can lead to a random mis-fire. Fuel restriction. VERY rough roads can cause s false reading, especially if it is a manual trans.Misfiring issues?
Try to put some fuel cleaner in the system, sounds like one of the injectors are dirty. Clean them as best as you can, if that doesnt work call me back. :)
My 4.3 did the same thing when the thermostat was stuck open. The engine runs too cool and messes up the fuel mixture and timing.
change plug wires and cap and rotor im betting its wires or an ecm going out
You've been given suggestions on things to do. Why dont you do them, instead of coming in here asking the same question over and over?
You are over your head on this one. The shade tree days are about gone. Suck it up, take it in and get a proper diagnosis. You can throw parts and money at it all day, if you want to, but to do it right, with a logical and surgical approach, requires equipment that you ain't got.