Cruise control question 98 GMC

Got a strange cruise control question.
98 GMC Sierra 4x4 had 5.7, but replaced it with a HT383 stroker from GMPP Prior to replacement, cruise worked fine.
Post engine swap, cruise takes 2-5 minutes to engage, and does not hold speed on grades. Very erratic operation. No other known issues, engine runs fine. Cruise cabling seems fine.
Ideas where to start?
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The key phrase is "Prior to replacement, cruise worked fine." I would look for a vacuum leak. Regards, JR
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BikeRider50 wrote:

Sounds like the tach signal or speed sensor is screwed up. Which induction and ignition are you using? What other changes were made?
--
Steve W.

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