I have rebuilt all my carbs and followed the manual to the tee on engine sync. with carbs and timing. runs great but idles a little rough. or maybe thats typical looper. does not die or anything just sounds a little rough i want to decarb the motor what is the best decarber spray or do i use both a fogger and a gas additive. what is better this amsol i read in here or the seafoam? what is the key ingeredent in these decarbers?