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Glad to hear it tobyw; One other thing if the stumble cold issue comes back---It may be an O2 sensor signal circuit shorted to voltage intermittantly, causing the pcm to lean out the mixture; I've repaired 2 GM vans this last week for this very issue!!! Simple pre-cat O2 replacement (both banks on the last one)---both rigs had the 6.0L in them....
