Lean fuel

I have a 1996 plymouth voyager, 3.3 ltr. With around 2ook km on it. The check engine light came on and I put a code reader on it and it came up as " lean fuel".
After running some injector cleaner thru the system the code was still there.I took the van to a garage, they said it was the fuel pump, after changing the pump, still the same thing. So they changed the cam sensor, crank sensor, etc. After paying my 1000$ bill I was driving home and the check engine light came back on!It now runs worse than it did before, also we now have to crank the engine over, stop and repeat this several times before the engine will fire.
Any suggestions would be greatly appreciated.

Jeff