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VinceInMt,
You call it a surging idle.
Does this only happens during idle and it is not a stumbling during operation?
You should be able to isolate the IAC to determine its function, though you seem to be thinking it works "sometimes".
- try blocking the air path to the IAC from the accordion tube (air intake), by wrapping a zip lock bag over the male nipple and clamping the hose back over it - this should choke out the engine so it does not start. If it doesn't, you have other air leaks. It seems to me there is little interference from the ECU during idle so this may not tell you anything regarding the surging - then I do not know your '83 and do not know if it even has and ECU.
- pull the IAC and clean and lubricate the valve (see other posts) - this may resolve an intermittent issue. Of course track down that wire - I have nothing to offer there.
My '88 has a TPS that played havoc with my idle. In my case it was only in the recovery function that played out as the idle not recovering quick enough and after adjustment recovering then revving to 2000. I ended up replacing the TSP and that fixed that part of the idle problem. I would seem possible that if the TSP is suffering a failure it would alternately tell the engine the throttle is open and closed and cause idle fluctuations. Again I do not know what is on you '83.
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1988 244 DL; B230F; LH-2.2; Manual 5-speed (M47)
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