My 91RS tbi idles high around 2000 in park an when I'm at a stop light it will be around 400 to 600 it changes constantly at stop lights an sounds like it wants to die. I'm new to tbi. And have no idea on how to tune one any suggestions on what I should do?
Thanks

 

go to the homepage and read the tech articles. read pon setting the iac and tps sensor. also remove the iac valve and clean it and the seat.

 

that's where i'd start also.

 

Yeah that helped mine too.

 

Might be also carbon build up in the EGR.