random misfire code after engine work

[azgolfrat]

hey guys,
After modifying the engine with 8 rib belt and pulleys, a 10% od crankshaft pulley , and a smaller pulley on the supercharger, I keep getting the random misfire code. Ive not retuned with Marty yet.. soon.
Could the larger crank pulley w/o a tune be the cause of the code?
Ive not heard or felt a misfire.
Thanks
-KK

[NATEHAWK]

Certain parts of the tune adapt and others don’t. It just depends on what your knock margin is and how much risk you’re willing to take. The increase in air flow is easily handled if you have the fuel system capacity. Either way get it retuned start there.

[azgolfrat]

ok, retune is scheduled for sept 17 w/marty & jeff.

what is the “risk” you are mentioning ?

thanks for the input


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