You have a good thought. Last summer I did a top end, in chassis re-ring job & had the air filter area apart. All looked good and I installed a new air filter. But......I didn't look at the intake system before the filter?
My '09 Big Red has started running rich, smells rich & spark plug fouls out after an hour or so of run time. I have had some fuel injection experience but need some thoughts on trouble shooting, sensors, and sensor values?