Hi guys and gals. I have a 98 'burb that I bought new. I have had a problem for the last 1.5 years in that the truck hesitates or hiccups at highway speeds. It is like it misses one cylinder firing. I have changed the fuel pump, filter, and ran several tanks with injector cleaner thru it. It seems to be getting slowly worse. It is not throwing any codes. I have seen other posts on here about similar problems and the run from a computer reset to a failing tranny. Any more ideas to narrow down my problem with out throwing tons of money at it? Thanks for any help you can give me.