2003 Jeep Grand Cherokee Larado

I have been having a problem with car sputtering when I am driving I have had it into shop 5 times they tell me that the computer has no codes so they have tried flushing the injectors that seams to have made problem worse. The jeep seams to almost stall when driving now I have hade a few instances where it must have stalled but pumping gas pedal has brought it back. Or so it seams because I noticed gas gage would drop to empty and light would come on to indicate tank empty even though tank is full If y0u have any Ideas it would be great as it is back to service station Monday Thanks Steve Shepperdson