I disagree with what tour is suggesting.
do not touch the throttle blades on an L98 unless its part of the comprehensive
“minimum idle set procedure”
there are systematic ways to solve runability issues on c4’s, where in the old days with carbs we may adjust the resting position of a butterfly,....not so on the computer controlled cars.
example, if you open the tb butterfly (they shipped with a plug from the factory. so if your torx bit adjustment screw is exposed, its been messed with) alone, in isolation from a complete minimum idle procedure, then the computer with command the iac to close as compensation. Then, when the user commands a/c to come on, the car has a mich larger probability to die or almost die due to the fact that the computer had to close the iac so far because the butterflies were opened further than they are supposed to be.
it goes deeper....if your car is full of small vac leaks—most un refurbed c4’s are, especially L98’s) , then the iac will ALREADY be closing itself off to compensate and bring the stoich back into spec. further exacerbating the effects of the solo adjustment to the butterflies.
and another further step into the rabbit hole..and this one is a pita (and not possible on the 85 for any fure 85 readers who find this post) grab a scanner (not a code reader) to ensure that during the min idle set procedure, your iac count is 25-30.
i discourage you you from willy nilly “tweaking” anything. thats likely how your car ended up with the issue in the first place.
im happy to assist you if you like. im in calgary.
btw, it sounds like maybe you already did the MIS and damaged a wire in your tps. So u likely already know the above information!!
Cheers and goodluck!