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I have a 1990 240 wagon. When I first start it, it would idle high and the gradually come down to about 1100rpm. Takes about 3-4 secs for that. However, if I drive it on the highway and then come to a standstill, the idle in neutral would be about 2000rpm. Ocassionally, after coming in from the highway, the engine in neutral would "hunt" i.e go up to 2000 and then drop down to 1100rpm and it would do that continuosly until I shut the engine down and let it cool.
I have cleaned the air intake, replaced the idle speed sensor, the Mass Air sensor was replaced a few years ago.
Any ideas.
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