Roger Long wrote:

Should you clear a fouled plug on run up with the mag on "Both" or switched
to the side that is running rough? Since it's just heat, I can't think of
any reason why one way would be better than the other.

If a plug is fouled and you switch over to the side that's running rough, there won't
be much heat on the affected cylinder 'cause that plug won't be firing well if at
all. Run on both. The engine will shake less, too.

George Patterson
In Idaho, tossing a rattlesnake into a crowded room is felony assault.
In Tennessee, it's evangelism.