Car is a 1980 242, with B21F engine, and K-Jet fuel injection. Experiencing an odd and intermittent idle issue. So odd and intermittent that at times I think I am imagining it. Every few to several months it seems the car seems to idle ether a bit too slow or too fast. I readjust the idle via the plastic idle adjustment screw on the throttle body. Then, all is fine for quite some time...until the next time I notice the idle is off. At times it seems I am backing the plastic screw out quite a bit in order to get the idle up to proper idle speed. All vacuum hoses are tight, seals around injectors are tight etc. Appreciate any ideas for further inspection, diagnosing or troubleshooting.
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