running rich

Hey guys, for the past couple of days I‘ve been noticing a strong burning smell, almost like running rich, when engine braking down a pretty steep hill. The engine sits at 1700-1800 rpm in 3rd going down the hill and only notice the Smell near the bottom but goes away while I’m going up the...

I have a 2006 Jeep LJ with a 4.0 L6 running a Banks Turbo. I am having problems with a P0172 and P0175. From the long lists of common problems that could create the error, Is there a known single characteristic that causes this problem? Where should I start

Need some help I have just replaced my 4.0 with a stroked 4.6 I started it up for the initial run in (20 min @ 2000 rpm to seat the rings) and I noticed that the front exhaust pipe (the one with the little catalytic converter on it) got cherry-red hot, but the rear one did not... what's up with that