I have several issues with my 1999 4.0L 4x4 XLT. First, I'm having trouble locating my Oil Pressure Gage Sending Unit. I've seen the Video on Utube but still don't see it. Next I think I have an issue with my mass air flow sensor. The truck runs very rough at idle and not much better when I'm on the gas. If I hold a finger over the MAF inlet it seems to improve. I have a
K & N air filter on it. Thanks for any Help