sputter?

cr9ek? plugs thats what weve always run and our dealer told us to run. im considering a tune, but we just had it in our shop to change plugs and oil and every hose/connection was fine. fuel lines are free, all plug wires are good, and mine seems to run better with premo(94). we have petro can deliver us premium to the farm.
 
Most of us who have changed our plugs are running the CR10EK's.
 


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