Nope. The computer will compensate by pulling the ISA in farther. Even if you unplug the ISA, the computer will compensate, I assume by changing the timing.
Before you change anything, be absolutely certain you don't have a vacuum leak. Get a full can of carb spray and with the engine idling, spray everything vacuum related, and listen for an rpm change. Pay special attention to the rubber block that connects the TB to the vacuum manifold. That is where my problem was.
The ISA has some special installation and adjustment procedures. I can't remember where I got it, but if anyone wants it I will be glad to email the .pdf to you.
Also, if you disassemble the ISA, when you pull the cover off pay attention to the plastic hex nut that is threaded onto the plunger. This affects the overall length and the closed throttle switch. Lose this length and you are well and truly screwed. Don't ask me how I know. :mad: