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Fixed exhaust now runs aweful, HELP!!!
Help me out here guys. I'll give you the whole dumb story. 2 weeks ago I pulled the driver side exhaust manifold to remove the gasket due to a bad leak. I got the head and manifold nice and gasket free and then reinstalled the maniflod. The truck then leaked like crazy and ran like crap at low RPM but okay at upper RPMs. Well, I replaced the manifold gasket and flange gasket Sunday and it started up and ran fine although I was not able to drive it. I went to leave for work at 6 this morning and after idling low for 10 min I could not get the 454 to rec without floooring it. I also noticed a popping coming from the driver side exhaust pie (true) duals). The truck ran fine before, what do you guys think?
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1978 GMC Jimmy, 400, th350, np203 with part time conversion, Fibrecraft popup camper, soon to get a 14 bolt/d44 swap
2001 Yukon XL2500, 6.0, 4L85E, 4x4, family truckster
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01-04-2011, 11:56 AM
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