My ranger smells like its running rich and has for a while. This winter when it was below 30 it fouled the plug once. And after I change the plug and got it started it wanted to die at idle. Once it warmed back up it is running again but still smells rich. I checked and it didn't show any codes. I tried unplugging and re plugging connectors under the seat, but that didn't help. I have adjusted the valves so I know they are correct, changed the fluids, oil filter, air filter etc. I'm running out of idea's, and I would like to avoid having to take it to the dealer. Has anyone else had this problem?