I have an 87 EXI. I have read quite a bit of information of the "bouncing" idle issue and the fixes. There are even some You Tube videos on this issue. What I have is slightly different and is not a big issue for me but is annoying. The engine starts up good and idles at about 2000 RPM. As the engine warms up the RPM's decrease (after about 2 minutes). At around 1400, the engine will bounce between 1400 and 900 for about 45 seconds. After the bounce the engine returns to about 1200 RPM and continues to warm up properly with no more bouncing. It sorts itself out without any throttle movement from me. It drives normally after this with normal idle. Because the erratic idle only happens at a specific point in the warm-up process I think it has something to do with the coolant temperature. When the coolant temperature is hot it is fine; when it is cold it is fine. What sensor sends the signal of the water temperature that controls the idle speed? Where is it located and what is is called? Am I even on the right track with thinking it is related to the water temperature? As I only have to live with this situation for about 45 seconds during the warm-up, I could learn to live with it but it would be nice to change as Spring has come to Canada and it is warm enough to work on the car again. Thanks for any help.