I have a 2002 grand caravan sport 3.3l. Yesterday it starts to struggle to go. I had auto zone check codes and it said p0172 p0442 p0300 p0304 p0303 I changed pulgs and wires and did oil change.. Nothing worked any help. Tomrrow Im changing fuel filter... I need help I cant get to work now...

 

First off, you can ignore for the moment P0442 as that is an emissions leak code that won't affect the way the van runs.
I'd check the coil.
Use this as a guide
https://dodgeforum.com/forum/dodge-c...ated-help.html

 

Connecting a fuel pressure gauge to read the fuel pump pressure at the fuel rail could prevent a needless filter change. The odds are the filter is fine considering they are designed to last the life of the van. I will never say never though.

Here's an article http://www.diycardoctor.com/ignition_testing.htm that describes strategies for troubleshooting misfires. All of us can use the info in the first part. The second is great for those who have a real time scanner.

http://www.obd-codes.com/p0172
http://www.obd-codes.com/p0300