Is the vacuum advance active at idle? The supplied vacuum come from the charcol/carbon/evap cannister. The advance works i checked and watched distributor move when under human vacuum .My timing is way off and the distributor is adjusted to the max. i checked mechanical timing and all looks good, Its all very confusing when it comes to charcol cannister. car starts and idles fine but sometime loses power while slowing and taking a turn. I can adjust timing when i run line directly from manifold to vacuum advanced port. its all very frustrating..