Looking for advice

well, I loaded a tune from Dougl that he gave me, it still had a stumble in the idle enough of one that it quit during a 12 min tune. I thought it might be plug related so I changed plugs, they all looked good,a nice tan color,except on had a almost closed gap. reloaded tune and set ISVC & Adaptives........ still stumbled....quit again during min. tune... relaoded Blastedbones tune from Hanso & did all resets... still stumbles but got through the 12 min. tune,,,, will road test on Sat... 300.km. trip planned... we shall see. . I have a slight backfire through the throttle body, what can cause this, I think I had it all along.:confused:

Perhaps you have vacum lines reversed? The lines come to a 4 way connector and then one hose goes to the sensor. Mine were crossed once and it would fall at idle.
 
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