Motor revs on start up after motor swap

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Jaxson Frye

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Just put a new motor in 97 chevy k1500, started a couple days ago and idled fine, started today to move around the shop and it revs up as soon as I start it, I’m completely confuckled
 

Drunkcanuk

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My 91 with the stock 5.7 every once and a while when I fire it up will rev pretty high, I just blip the throttle and she drops down. Never thought much of it. But it definitely seems like it does it when it's colder more often than not. Not sure that helps.
 

kennythewelder

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Mine was doing the same thing. Alternator quit. I replaced it, and the battery, and it all cleared up. No more rev on start up. Just a FYI.
 
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