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Re: Truck stumbles when cold
Is it stumbling all the time, intermittently, or just on acceleration?
Timing issue? Mine stumbles on acceleration if I don't have the timing advanced a little bit from spec. I haven't chased down the reason why yet (it's gotta be either the vacuum or mechanical advance is lazy, I guess), but it runs ok if I put the timing at +13 or so.
A $15 vacuum gauge/fuel pump tester combo from Harbor Freight would let identify or rule out vacuum leak and bad fuel pump. Plus there are wise men on this forum who can tell you all about reading the tea leaves of vacuum gauge behavior to diagnose other issues.
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