I replaced them when I was doing the thermostat. It was throwing a code and running cold. Strangely, the gasket that seals the thermostat closed was deformed and leaking (from the cold side to the hot side).
Anyway, I did intake gaskets as a matter of prudence (since the intake was coming off anyway and the gaskets are notorious).
The truck had about 50000 miles on it last November, and had this cold start problem since a little while after it was new, but no one could ever find the problem. The problem went away after I replaced the gaskets, so I thought maybe it was related.
Now, I have about 55000, and the problem is back...
Anyway, the truck runs fine after about 60 seconds, so I've almost gotten used to it. That's not to say it doesn't bother me, though.
Nate
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