ok so I drove my 97 lude to walmart to night and it drove fine. (I have a cel on for the ect sensor and I am taking it into the shop tomorrow for a look over.)Now I get back into my car and get ready to drive home. Start it and it takes a second, then I give a little gas and it feels funny,Like its purrring. (almost like 3 cylinders) So I get out and pull the wires just to make sure and it reacted normal. So I went home and pulled the plugs out and it looks like there is alot of carbon deposit on the outter ring.That tells me its running rich. (I think that is becuase of the cel for the ect.) anyways I started up at home and it runs ok now but it still sounds like its misfiring . My question is you think that is a really bad problem?I pulled the codes just to see if there were any other cel on but it just flashed six times and stoped then repeated it.