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Re: PO420, P0171 Need Help Please
The spark plug tube seals come with a valve cover gasket set. You have to remove the valve cover to change them so you may as well install a new vc gasket while you're at it.
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99 Rodeo LS 3.5L Stroker V-6, 4wd, 31x10.5x15 2 inch Trooper lift, Aisin manual hubs.
03 GMC Envoy XL SLT 4x4 5.3L V8
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