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buddy, i am having the exact same problem as you and have been working on it for a couple of weeks. I have replaced the Fast idle air control with a used one, after doing so looked at my old one and the washer was all the way loose so i figured that was my problem. Im sure it would of created a huge problem, except for there must be another problem. I have replaced the IAC with a used one as well and cleaned both and have same results. I have bled the coolant and retopped. I have sprayed carb cleaner on every hose and all around the IM and TB but no sudden surging as i do. Im pretty much stumped.
When I unplug my IAC, it changes patterns. It goes from a long rise and drop to a very very short rise and drop (more of a rumble) and it does so much much faster. Now when I unplug my throttle position sensor (that is the electrical plug on the back side of the TB right??) it takes it about 10 sec...then it quits the idle surging, and it idles smoothly at a very very high idle. Prolly somewhere around 2K higher than usual (i cant tell since my tach is off). Im thinking of getting a TB and replacing it to replace that TPS sensor. One other thing, when i replaced my FIAC the water hose coming out of it was blocked by hard corrosion or something of that sort, Im certain no water was getting by at the time...it is now free flowing. Does anyone have any other suggestions?
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94 Si
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