1999 Jeep Wrangler Misfires

Why do you suspect they are out of order?
If you get a flashing check engine light. You will have a code that tells you which cylinder.
Most likely a bad plug wire.

It gave codes for multiple cylinders. Last night I pulled the plugs and re gapped them all. Everyone of them had a much bigger gap than recommended. After doing that and pulling the battery cable the check engine light went away. When I drove it right after doing that work it stalled just a little. This morning it drove fine with no check engine lights.

So I'm guessing the gap was the problem and it's ok for now.
Thanks

The Jeep never actually quits, but when it's first started it "lags" "stalls" "loses power" (not sure how to explain it) but after a couple of seconds it clears itself and runs fine. The check engine light is no longer on after changing the gap on the plugs. Could this be trash in the fuel? I've tried a high octane fill up that is almost empty. Should I try injector cleaner?

Thanks

Check Engine light just came back on today. The codes are PO300, PO301, PO302, etc up to PO306.

The plugs and plug wires are brand new (within 30 days) and the firing order is correct. The gap is correct.

What should my next step be?
Does the 1999 Jeep Wrangler have an EGR Valve or Solenoid?