Chugging and check engine light codes 300,303,304 and may have more?????

You have thrown a lot of parts into this and it looks like an internal engine parts issue. You need to have a cylinder leak down test run on it. Sounds like a valve issue.

Check for a vacuum leak around the EGR Valve . It is possible the EGR valve stuck open after cleaning it and causing an internal leak now.

Many times, this will go off and it won't be a problem. Just go ahead and take it off to make sure it is not clogged. Just go ahead and clean it out. You might need th change the egr sensor. It may be given off a false reading. As long as it looks good,it is clean, and nothing is in its path, it should be good. Is your Rodeo acting up any?

Fixed error code P0894 - They replaced torque
convertor, solenoid, filter and did a flush.

The mechanical components of the egr themselves may be fine, but the electrical circuit that moves the egr may be faulty. now if the egr valve uses vaccum to operate, then it may be sticking just enough to throw a code.

the gas cap and check engine light thing are related in terms of the EVAP system, or the evaporative emisions system. This is NOT where your surge, or "chug" is coming from. The surge could be coming from a Exhaust Gas Recurculation valve that is starting to bind or "hang up" a bit. DO you notice this happens more at lights, or when coming to a stop? if so it could be an idle air control vavle.

I have the 2005 Town & Country TOURING . If my memeory serves me correct, I believe this was the same code that I got on time. The van didn't seem to drive any different but this is what I did and I haven't seen the light come on since.
first I went to the dealer ( you can get these parts from a auto parts house also) and bought the 3 gaskets total.for the the EGR solenoid vavle assembly where it bolts on to the engine ( that gasket was made from metal), NOTICE AN INDENTATION IN THE METAL GASKET WHEN YOU TAKE IT OFF,YOU WILL WANT TO PLACE THE NEW GASKET IN THE SAME DIRECTION. one gasket that goes between the EGR valve solenoid and the small stand pipe. and another gasket that goes between the stand pipe and where it connects to the plastic valve intake area cover on top of the engine.
I took the EGR solenoid off from the engine and took it apart (reall carefully) and cleaned it thouroughly with a spray carbuerator cleaner. I took mine "completely apart" after I did this I dont recommend to do this again, you can damage the coil inside if you're not cafefully. I suggest just cleaning the valve and plunger ports, etc....
When it was completely dry I reinstalled the EGR solenoid on the van making sure I used ALL NEW GASKETS. The van hasn't produced the engine light since. I hope this helps.

read this article, it explains that you have plugged EGR gas passages, the valve is not the problem, but read the link.

http://www.asashop.org/autoinc/sept2002/techtips.htm

the infomation u were given is 100% wrong! if the light is coming on then a problem exists in the OBD 2 engine control system, there will be a fault code stored for the check engine light, who told u this the dealer??

yes you will have to hook it to a scan tool and erase the dtc or the light will stay on. sometimes you can unhook the battery for 30 sec or pull a fuse or turn the key on and off a couple of times