Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - 1977 Chevy K20: Engine Suffers from Hesitation/Power Loss When In Drive
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Old 02-12-2012, 10:59 PM
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cobalt327 cobalt327 is offline
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Have you had a chance to get the truck out on the road and drive it? It'll need to have a thermostat installed at some point before you begin using it, I'm supposing after you flush the cooling system. After the thermostat's installed, I'd run the truck around the neighborhood for 15 minutes to give it a chance to get up to temp and see how it behaves then.

I seem to recall the fuel was drained/replaced?

That vacuum line to the modulator valve- bend the hard line so it's pointing directly at the valve so the rubber hose connection is straight. It might be the photo, but the hose looks like it's becoming delaminated where it's bent. If there is any question, replace that length of rubber hose w/a new piece.
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