You realize, of course, you've been able to 'fix' this several times. The coil packs should be secured and double-checked.
MSD does make hotter coil packs for this application if you want to upgrade.
I also had a 2.2 S-10, and the engine seemed to have an inherent slight miss. It drove fine, so I never worried about it much.
Then I upgraded a few things- K&N FIPK, Magnaflow exhaust, and the MSD coil packs & wires. I also added Bosch plugs.
The miss went away and never came back. The truck made a bit more power, and sounded better with the Magnaflow muffler. The biggest change was in fuel mileage- it went up measurably to around 30 mpg on the freeway.
Otherwise, the truck was okay. I had to change out the Dexcool and flush everything after I got corrosion in all the freeze plugs, though. Keep an eye on that. Regular green coolant is the fix, and it works fine.
The 2.2 was a decent engine. Not the kind of power I'm used to, but better mileage than anything I've ever owned.
Step up the ignition parts, and make sure they are installed securely. That should cure the problem.
~SP~
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