The stock Champion plugs work well, some say the truck plugs are better. I prefer a silicon plug wire, spiral wound solid core, with a long spark plug boot (Accel, Blue Max etc.). With a stock (resistance) coil to cap wire.
The distributor cap can be a sore point. I actually change mine about twice as often as I change the plugs. My plugs seem to last forever, I just regap them every couple of years. I have a whole box full of perfectly good plugs that I have swapped out unnecessarily.
Seperate the coil from the ignition module, gently clean the contacts, between the two. Clean the dipstick holder and the head to firewall grounds.
Avoid any miracle sprays or other snake oil. A quality electrical contact spray being the exception.
An occasional miss at idle, really doesn't mean much and is often kind of a generic Renix thing. I really don't know exactly how I got mine to idle correctly and fire without missing a beat at idle. Got lucky I guess.
An occasional can of gas tank added injector cleaner (brand name), sometimes seems to help. At the very least it also works as a gas tank dryer and the fall and winter months are known for condensation building up in the fuel tank. Which can sure enough cause a miss, especially on a cold motor.
The miss is often moisture and/or corrosion in the distributor cap tower and/or cable boots and the plug ends. Sometimes cracked or leaky plug wires and sometimes the inside of the distributor cap, the gap between the rotor and the lugs, gets a buildup of corrosion and the gap grows. Carbon dust in the cap can also cause occasional strange ground paths for the high voltage spark.
Sticky injectors are harder to find.
A good trick is to hook up a tinming light to each plug cable (one at a time) and point it at a dark spot (any old spot will do), you can see a miss pretty quick. Helps narrow down which cylinder is causing the problem.
