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I had the same problem and your right no egr on 2005 town and country I have the same vehicle and the place for the egr is covered by a metal plate I also had the same exact problem with my van misfire bad idle at stop lights and after replacing every sensor there is and testing every part and injector with Ohm meter I read an article about the intake manifold plenum gasket leak can cause misfire so I bought new intake manifold plenum gasket set for only $7.99 and installed them and like magic the van ran perfect no more misfire no sluggish start from light Van is fixed finally!!!
P0304 Code indicates a misfire on cylinder 4
Most likely causes for this are bad wire, bad spark plug, bad coil(s) or bad dist cap if so equiped.
A vacuum leak can also cause a misfire.
Seeing the vehicle is going on 13 years old replacing the wires and the plugs would be a good place to start, and could be the solution
Check the compression on that cylinder,and see if it is lower than the others or is flucuating up and down,also it can be the harness to it,from the computer,now if it is not,then the computer would be the problem.If this was at all helpful,please rate,thank you.
you need a blower resistor maybe a blower motor also but the resistor is for speeds and it usually goes when the blower motor starts to draw too much power the resistor is outside under the cowl on the passanger side you may need a connector pigtail also the dealer will have what you need
they are on the front drivers side of the transmisson and have two wires coming off them, there are two one is an input shaft sensor and the other is an output shaft sensor unless you have a 4 cyl van then there is only one sensor please rate -jeff