Re: ignition problem
Some good info there! Saw a problem like that on a different vehicle once. About 5k miles after Platinum plugs were put in (didn't come with Platinum), would miss and sometimes stumble under light acceleration, like after turning a corner, for example. Could hear some pops in exhaust system then. Wires OK. Plugs changed to same make and number as what came in it, no more problems ever.
I think mg48 is right on the effective spark gap resistance versus rpm/light load.
About the "pops"... What I have concluded over the years, is that if you hear a "popping" in the exhaust, it's usually that one or more cylinders probably had a decent mixture, but didn't fire, and then lit up rather poorly in the ex. manifold or pipes due to the heat. And that the reason it didn't fire was ignition problems, whatever they were. So it seems if it really is only popping on one side, then something that's not common, that's on that side is suspect, like mg48 was getting at. Then again, maybe the side that's not popping, is getting real close to doing it too!