Originally Posted by PaulNYz

According to most, the best way to get rid of it is higher octane fuel. Another option is to get on it more in first- you're wife may be lugging the engine a little. I can't say for sure, but the situation your wife describes may constitute a heavy load.

Mine is a 6MT. I notice it in 2nd + 3rd when lower than 2k RPM and evenly accelerating. Anytime the load is lessened it stops.