Yesterday at the printing company I work for we took delivery of our new 2004 Isuzu NPR 132.5" WB with a 14 foot Supreme box. We got it for $28,600 out the door. The salesman delivered it to our door, and he took our trade-in back to their lot. I was out in the truck last night running my route and was at about the 30 mile mark of 70 miles total. Everything was going great until I heard this loud BANG followed by a loud hissing sound. I immediately pulled over and hit the 4-ways. The engine proceeded to make the hissing sound at idle and got even louder if I pressed down on the gas pedal. So, I shut it down and called roadside assistance on the cell phone. After about 90 minutes, the wrecker got there and hauled it off. I ended up having my supervisor bring me our other truck to finish out my route. The salesman called me mid morning today and said that a line had blown off of the intercooler and it was fixed. He is going to deliver it back to our shop tomorrow morning. I was relieved to find out it wasn't something terribly wrong. The owner was especially discouraged being as the truck only had a little over 400 miles on the clock. I tried to assure him today that everything should be ok. Otherwise, the truck is awesome and is a really impressive performer with a load on it. Has anyone ever heard of anything like this happening before with the NPR's, or is this just a fluke? I will try and get some pictures of it up sometime here soon.