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avtonomb

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  1. As many know, p0300 is random/multiple misfires and p0420 is catalyst efficiency below threshold drivers side. Any way I got the truck checked out and the mechanic says the drivers side cat was dead. That's fine it's still under warranty. Then he told me that the reason I have the p0300 is because I have a leak in my intake manifold??? He did say it was running lean at idle for some reason . Do our trucks have a problem with leaking manifolds? Any body hear something like this before? I have extended warranty on the truck, I just don't want the mechanic to take advantage of me. Truck runs fine so idk. What do you guys think? 2005 SSS 65k miles, magnaflow cat back, volant, Wheatley

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