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Re: 4.3L V6 TBI will not cold start, idles too fast
High idle after a Cold start really isn't that unusual, especially in old vehicles. Just let the engine warm up before you take off.
As far as the rough low idle, make sure the fuel injectors are squeaky clean at all times. The TBI system in general is an inefficient dinosaur, so in order for for your engine to run properly, every single component has to be working just right.
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"Ok, systems check; the battery is discharging, the oil temperature is very high, the oil pressure is very low, the engine temperature is off the end of the scale, I'm running out of petrol... but the clock is correct!"
-James May, in an old, worn out Lamborghini purchased for less than £10,000. 
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