First of all, it's not reading the computer, so I can't get a engine code off the scanner. It has a 4.2 in it, and it seems to be running on one side of the engine and not the other. I changed the spark plugs and after running it for a mile, the 3 exhaust pipes on one side of the engine is hot to the touch, while the 3 pipes on the other side is just warm- cool enough to lay my hand on them. I pulled the plug, grounded it, started engine, and I have a bright yellow spark on the side that's not getting hot. Wtf?? We're do I go from here.