I just bought an 03 6.0. After i put 100 miles on it the truck startd backfiring through the airfilter. After reading a bunch on here i took the egr out and cleaned it. Truck ran great. But now it seems like it takes forever for the turbo to spool. And every now and then i hear an air leak more like a squell. Like when you pinch of a balloon and let the air out. (that noise is hard to explain). Any help would be appreciated.