Run the iridium, last 10 times longer & require less voltage to fire & the center electrode in not shrouded by the side electrode. The end result is a better flame kernel. Gap at .045"
Make sure you have no more than 3# fuel pressure to the weber which you previously stated.
Check your gas tank cap for proper venting.
Make sure you have no more than 3# fuel pressure to the weber which you previously stated.
Check your gas tank cap for proper venting.