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leonine said that he had the same problem with using colder plugs in his car due to the engine running on the rich side.... He was very adamant about using stock heat range plugs..... I have stock heat range plugs in my car and notice that at times when driving at low RPM in traffic I will feel some hesitation unless I pull a few more revs during acceleration to clean the plugs.... I can tell a difference in the exhaust odor since installing the KWSC and mentioned it and was told that the A/F ratio was he same as the stock ratio by Oscar Jr..... Oscar Sr. recommends the IK22 Denso plug for performance driving style so I guess hat you have to be very light on the accelerator pedal at low RPM and stay in the lower gears until you are over 3000 RPM to not load up the plugs..... The taller gearing of the A/T cars would seem to compound this problem.
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