The first time I sprayed my truck tuesday that thing hauled ***,but know its not as noticeable. The only thing that changed, is I forgot to open the bottle one time and shot just fuel . The truck idles perfect, but if I fouled a plug wouldnt it idle rough?

 

Might be low on bottle pressure, You didn't mess anything up if you did it one time, and it would idle rough on a bad plug or throw a ses light

 

What he said....bottle pressure if everything. Do you have a bottle pressure gauge?