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50* EGT's with 3cyl idle.

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I don't think there is any real issue here, just thought this was weird.  I have started my truck the last 2 days with the 3 cylinder high idle engaged.  When I get in the truck my EGT gauge is only reading 50* while the Quad is reading around 560*.  I have both sensors mounted next to each other before they enter the turbo.  When I step on the brake and return to normal idle, both readings equalize.  Does the 3 cylinder idle shut off the first 3 or last 3 cylinders possibly causing this?  I kind of assumed it shut off every other cylinder, 1/3/5 or 2/4/6.  If it matters I am using the moparman switch with the TSB enabled and not the Quad high idle functions.  

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