I have a 93 dakota with about 143,000 miles on it....i recently had an issue with it concerning the vacumn line to the egr vavle and fixed that.but in the mean time i ran about of raw gas through it.and ive been cleaning that out for the past week now with seafoam.i am still having and issue wiht the idle and it like shifting....as it downshifts u can kind of feel it (its automatic) also when its changing gears.the rpms will just jump back and forth....any ideas?maybe some kind of sensor?

 

If you have been running real rich then you may have to change your spark plugs again. Once they get carboned up they will short out and there is no good way to clean them.