Well that is the reason for the driveability issues as was pointed out above. Even without the LIM with the secondaries removed the PCM still has programming for it and is still going to expect the open/closed signal from them as well as adjust fuel and timing for them.
The only way to keep that pcm and turn them off is with a chip or reflash.
That is your motivation for the tune from ADC. If you don't want ADC then try
www.brenspeed.com (I think that is the address) and see what he will do for you.
