Q: When you acclerate after slowing down or when going up a hill it is cutting out? on 2008 Chevrolet Uplander

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I ahd transmission checked its not the issue had codes read and none came up so Im thinking its a something to do with feul line or filter?
(1) Answer
could simple as fuel filter(rec. change every 20,000 miles). could be build up in fuel system or exhaust system. try ethanol treatment to 1 tank premium to clean fuel system. ethanol blend in today's fuel causes a lot of build up that can inhibit fuel delivery as well as increased wear on spark plugs. review when last tuned.
may want to consider upgrading from conventional air filter to a high air flow filter(K&N).