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Hmm. First, if it was cold enough, 4K ohms may be ok. The 2K ohms figure is for room temperature, 70 deg. F or so. If it was as cold as in the 40's, 4K is probably right. Bucking after starting is usually an indication of the car being too lean. Too rich and you get bogging - push on the gas and no power, stinky exhaust, easy to tell/smell. Since the higher the resistance of the head temp sensor, the richer the mixture, bucking doesn't fit what I would expect.
Did you check the fuel pressure? Too low = too lean. How about the injectors? Clogged = too lean. Condition of your plugs? Fouled = crappy ignition = bucking. Timing and dwell? Can your mechanic put it on an A/F meter and tell you if it's lean or rich when at part-load when cold?
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