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EGR allows timing to run at greater advance rates.
EGR controls NOX by lowering peak combustion temperatures.
I had the same year Ranger. I left the EGR system alone. I did run injector cleaner and changed the plugs, big pain on the dual plug 2.3 4 cylinder.
Before you consider altering the EGR system, make sure you have all other potential maintenance issues in top notch condition. Without EGR the engine will knock and you will have to retard the timing to get rid of the knocking, which will definitely hurt your mileage.
regards
mech
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