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When were your plug wires/cap/rotor last replaced? If it has been a while, take the cover off the top of the engine, and look for arcing when it is dark. Also inspect the coil and its wiring, but that is least probable.
Make sure your vacuum hose elbows, especially the one coming out of the intake manifold at the front of the engine. Any cracking, and you will have O2 sensor problems and run too rich.
The 0hm values for the engine coolant temp sensor are 2800 at 68F, 1200 at 104F, and 150 at 212F. Just unplug the ECT and check it with a volt meter, before buying a new one.
Klaus
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The 164 has a new home, all I am left with are a 95 854T and a 98 V70R :)
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