My turbo89 automatically high idles whenever it gets worried that its getting hot, then it goes back to low idle... dunno if that helps. when you say idles unstable can you give a little better description? Is it all over the place? IS it high low high low. Does it sag cough sputter almost die then back to normal, it'll halep diagnose if you can give a bit more info. Does the check engine come on as you rev through each gear or only at 50? Are you sure it doesn't come on at 40? Changed all your filters and oil lately right?
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