Iv'e searched but somwwhat confused. 380SE just started to exhibit rough idle when first started cold. Starts ok but sounds like it is stumbling. Goes away after driving for about a mile, and is smooth as ever when warmed up or even before temp gauge gets to 80C. Saw others comments that this may be due to faulty water temp sensor among other possibilities. Where exactly is this part located( off the thermostat housing?). Vacuum lines are fine, new plugs, dist cap, rotor. Problem only exits when I first start it up.

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