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Shoot, both of my cars can sit for months, 2 pumps and they fire right up. Both holley carbs, both mechanical pumps. You sure it's not boiling out ?

not sure if you worded this wrong but, the downstream O2 is a monitor only. The only function the downstream has is to monitor catalytic converter efficiency, You compare upstream / downstream readings and the difference will let you know if your cat is working or not. Downstream has absolutely...

Go to your local muffler shop, they should be able to replace it for a decent price. Somewhere around $300, that's what they charge over here.

only the ones above the cat will help ... or you can remove the headpipe from the manifolds if not too rusty !! You want to do both banks though

take the upstream O2 sensors out and drive it. Will make some noise, but will tell you if you are dealing with a clogged cat converter. Sounds like that might be what your dealing with, those trucks make a funny sound when the exhaust is restricted, and obviously have no power ...

Do not get them ! A buddy of mine put at set on his big block '69 mach 1, broke 2 just driving around on the street. Did not even get a chance to abuse them. Called the company and they sent him a brand new set. Less than 200 miles later, same thing. Company will not return his calls now. He has...