Last week I was in Fla. picking up a new fifth wheel and my truck stalled after restart in the dealers parking lot. It was very hot outside. After a number of tries it restarted and ran fine all the way back to NY. At the RV dealership in Fla. a tech put the Tech 2 meter on my truck for me and said my fuel return rate was 1400 and that it was "maxed out" and I would be needing new injectors. Is this enough of a problem to get them replaced under the new GM warranty plan or does something more catasrophic need to happen?

depends on the tech.