2005 dodge caravan 2.4 we have change the fuel pump the crank shaft sensor and the cam shaft sensor and it is still doing the same thing.

Have you tested plugs for spark? Could be coil(s)

probably not the fuel pump because it has pressure to start. run the fault codes and check for a problem crank/cam shaft position sensor

Speed sensor , oil sensor , cam sensor

run the fault codes to determine the faulty sensors

Could be the fuel pump or pump relay going bad.To check relay simply replace it with another.It also could be the crank sensor or cam sensor.

I would also look into changing the Cam sensor since they both communicate back and forth to each other...

Do you get any trouble codes like P0320? This is the code for the Crank sensor. I have a 2003 Caravan myself and that is the code I was getting, but after replacing the Crank sensor twice it turns out it also needed the Camshaft sensor. Good Luck.

If you have good fuel pressure. Check for spark at any plug while cranking, If no spark, also place a screw driver on an injector and listen to it while someone cranks it over. If you have NO spark and NO injector click - crank sensor needs to be replaced. 95%
other 5% hmmm wiring problem on / near crank or cam sensors, theft system active, dead pcm.......

it is on top of engine at the back were the cam-shaft is hope i have helped you

maybe have autozone or equal scan the computer for codes. could be a misfire in the cyl. somewhere. give me a code number and i will try to assist you further.