February 20, 201313 yr Both my SPFI non turbo Loyale wagons have done this at times; with engine warmed up, usually at a stop light. they hunt between 850-1150 RPM . Not all the time but often enough to be annoying
February 20, 201313 yr in my case I cleaned the idle air control valve ,( it had carbon buildup on it) and I had scale buildup on the coolant temp sensor , after doing this my idle was rock solid .
February 22, 201313 yr Check the intake manifold gaskets for a air leak. That is a fairly common problem with these cars.
February 22, 201313 yr Check the intake manifold gaskets for a air leak. That is a fairly common problem with these cars.yes good advice , does your duct work change to vent during heavy acceleration
March 3, 201313 yr I had the up/down idle for a long time. Cleaned the IAC but still had bad idle. Found reconditioned one on Ebay for $50, slapped it on and no more idle issues....purrrrr. As for the duct work changing also has not done it since. Edited March 3, 201313 yr by superpoo93
March 3, 201313 yr Mine has done that on and off throughout the years. Cleaned IAC several times and also I have seen it most pronounced when my alternator was going out. I have replaced the alternator at least three times over the years.
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