My suburban has been starting hard for the last couple of days and now when I take the gas cap off there is a lot of gushing air.
sounds like it is getting vapor locked...try a different gas cap, otherwise, there isnt much you can do with that
Do you have a check engine light on?
Search Chevrolet Suburban Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Chevrolet Suburban Experts