Google "weep hole" modification to intercooler. Mine was idling rough and surging when passing. This fixed the problem immediately. I have since talked to two friends with the same truck that have had this problem and fixed it as well. Takes less than five minutes to do but I do suggest changing the spark plugs as well.

Eagle Lake, Mississippi is close to heaven.

"Everything Hipsters touch turns to chit........Period..
Whisky.....Beer.....Tobacco.....Boots....Clothing....Gear......you name it..
Good thing the fuggers don't like firearms.." Fieldgrade