Hello, When ever it is wet outside my 350 runs like crap. It wil not idle when I come to a red light it wants to die. But just as soon as it starts to dry up outside the truck runs like a champ. I will be pulling this engine in a few weeks to dress it up and add a few goodies. The engine is a Mr Goodwrench engine It has less then 15,000 miles on it. It has a Accel super coil, High preformance wires. *Edlebrock fuel filter, 600CFM carb, EPS polished intake.