You fed the Sea Foam in too heavy causing a flood out condition.
When you feed the Sea Foam in, slow feed is better and raise the engine rpm to 12-1500 until its done.
Just drive it around. It will clear out and stop misfiring.
I drove it a couple miles and it didnt clear up, let it idle for a while too, then just went for a 1 mile or so drive...the only change was when engine was cold there was very little misfire but as temp warmed up (which was quicker than usual but could just be because it was driven previously) it worsened.
when you first turn the key to ON, does the CEL actually work?
also, there can be pending codes so, might be worth scanning anyway.
do you know how old the plugs and plu wires are?
any more info on the car and the exact problem you have with it will be helpful.
probably beyond me, but others will reply I'm sure.
I checked and i have several lights not working on my dash it seems..
I am hoping its just bulbs and not the stupid controller i have been reading about.
I had no real problem besides very minor piston slap on cold start, thogugh I did notice a smoking exhaust but attributed it to it being winter, I smelled no burnt oil, fuel or antifreeze smell from exhaust, but figured a cleaning of the intake and such couldnt hurt. I had read that carbon build up could be the cause of piston slap and it is/was so minor I didnt think it was an actual mechanical problem.
And it does seem the slap is gone or diminished by at least 50% which with the door closed and window up would make it inaudible.
So now my issue is sever misfire under load, but smooth at idle.
As for plugs and wires, I cant say since at this point i see no reason to trust the person i bought it from after seeing antifreeze on the engine.