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as you accumulate miles and the fuel goes thru the system the tiny contaminants that the fuel filter did not catch start to lodge in the fuel distributor and mess up the calibration.this happens very slowly and is not noticed by driver.there is no way to tell when you are driving down the road at say 2500rpms how many cylinders are lean or rich or correct.i noticed this while having a car on the emmissions dyno on the manual readout with car under load at 25mph.when i dialed in the fuel at 25 and then let car back to idle it was way too rich showing that the fuel distributor was no longer linear.even here we are looking only at results of combustion and not at the individual quantities of fuel going into each cylinder.but at least it gives a clue and logic works from there.
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