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The only thing in the distributor is a hall-effect switch and a window wheel. I would not advise screwing with it. It's essentially just a crank sensor.
Now, if the sync is off between the cam and crank, you mileage will go to crap. It can be checked with a scan tool.
I have a resistor for my hemi (2003 Ram 1500) which is supposed to better the mileage. Anyone know how this is installed?
Are you referring to a "chip" (which is really just a resister) that goes on the intake air temp sensor? Do you have a picture of this "resister"? It did not come with instructions?