Mountainbred

Hey bud, I have an 87 as well and have gone through your problem with my own. To adjust idle the easy way you can rotate your distributor cap while the engine is running and have someone tell you when the rpm gets to around 900. Make sure that the engine is hot as it will run at a higher rpm while warming up. Also if you notice that the rpm does not drop when the engine is warm you might check your intake coolant plunger (can't remember the actual name of this thing). Its a little cylindrical canister on the front of your throttlebody. There should be a few cooling lines running to it. If the thermostatic plunger in the canister is not moving then the idle will not go down. Its not a cheap fix but It might be worth it, also it is a pain to adjust. It is not controled by electricity so you will not see any plugs going to it, just those two small coolant lines. Hope this helps.