Why Catalytic Converters Fail - Walker Exhaust Video Series
Husqvarna, Poulan Pro, Poulan, Weed Eater, McCulloch
Schumacher Riot tuning/performance
I have a 99 dakota and my engine is running lean, what can i do to fix that.?

my truck runs hot doing over 50mph and i got it checked out and the guy said it was running lean, i've changed my waterpump and thermostat, what can i do to fix it from running lean? and will that fix the truck running hot, and overheating?
Forget the running lean thing. He is guessing.
Find the source of overheating. It will most likely be a bad fan clutch, or dirt stopping up the radiator.