I had the same issue with my old 8896 until I sent it to Thumperdart. It would kill plugs in no time at idle & cruise. So I had him modify and install some new 2 circuit metering blocks and 12 hole boosters along with the other modifications he does and could not be happier with what I received back from him.
I have one identical to this from Thump....my results were the same. Sad thing,,,my block cracked first time to the track after installing it. Putting new motor together now. Probably be Fall before I get to try it some more.
