5.7 Vortec engine

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Jim O'Connor

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I just installed a Jeggs engine in my 98 tahoe 2wd. Checked all fluids good, Cranked over 2nd try it started up and went into a very high rpm. Shut it down. Tried again couple minutes later, same thing starts and it's like your foot is on the accelator flooring it. shut it down again. would this be a common situition or am I missing a red flag here?
 
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