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1990 740 b230f, erratic idle when fully warmed up- 10/15 mins of operation. removed head to have plug theads chased, checked head for warpage - found none, reinstalled, replaced head & intake mnifold gaskets & idles erratically. did not do this before removed head. since have replaced plugs, plug wires, distributor cap & rotor, coil, o2 sensor, temp sensor, air mass meter, idle air control valve, fuel filter, fuel pump check valve, air filter, checked all line & hoses for condition & leaks, fuel pump regulator, listened to injector with stethescope for clicking, injectors each have 16.0 ohms, all fault codes now cleared, 1-1-1. any ideas?
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