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I currenty use the TR55 in my car. Ive used the TR6, and the stockers. Never noticed a performance differance in the three. Im just a heads and cam car. Ive had the stock plug in the car for 8 years, and over the last 3 years changed from TR6 to TR55. Maybe if anything Ive notice a slight differance in engine running temps by maybe 3-4 degrees, and frankly that's most likely the gapping of the spark causing that. No performance gain for the Tampa Tuning mule.
Bolt ons with or without a tune shouldnt cause an idle issue, but if it does you'll have to adjust your adaptive idle proportional and integral airflow tables and /or start up airflow slighty. ( very slightly if the car is stock but most liked not needed at all) Ive never had to do this on a pure stock bolt on car. The tables in pounds per minute
Id just check to see if a spark plug wire is loose first.
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