Hi! I got an error code on my 2006 dodge caravan - 82000 km.
P0304 - cylinder 4 misfire detected.

fuel sys 1 cl
fuel sys 2 cl-fault
calc load 36.84%
ect 194 f
stft bl -8.03%
ltft -2.34%
map inhg 14.77
eng rpm 329
veh speed mph 39

spark adv 39 degree
iat 69 f
tps 17.65%

Do you have any clue to fix the problem?
The car run normally. The code appeard and went away by itself. But I would like to fix, if not too expensive.

 

Spray the spark plug wires with salty water and look for lil sparks......if u can remove a couple of spark plugs............probably used plugs....change em all with the wires....