08 Chrysler Aspen 5.7 Hemi....It starts to hesitate like it wants to die on me?

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I have an 08 Aspen with 5.7l Hemi. I was experiencing hesitation and jerking as if not wanting to shift gears.3 weeks ago the dealership found and changed a MDS solenoid and main brain on dash,and now the problem has reoccurred but worse. The dealership cannot find what is making this happen AGAIN. The mechanic felt the hesitation as if I was out of gas and wanted to die, they put on machine and NOTHING shows up. HELP!!