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I would suggest doing a load test on the plugs when you check them to see if it is lean. Find a large parking lot with plenty of room, get the car up to speed (i.e., expected rpms that you will be operating in) and then while at speed turn the ignition off and coast down to a stop. Then check your plugs for color and determine if you are running lean or not. You do not get an accurate representation of A/F status if the engine idles for long as it may be richer at idle than under load and that will alter the appearance of the plugs when you pull them.
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