85vegasvette

driving around enjoying the weather, came to a stop and idle was surging form 6100-4800, gave it a little gas and smoothed right out...What the hell is going on?

belairbrian

Are you sure about those numbers? That's turning faster than the engine should. Could it have only been the tach reading?

Rohn

throttle blade or cable hanging up? Actually happed to me at full WOT.. To this day don't know why. Cold day (45dF). No heat to TB or manifold.

85vegasvette

sorry yeah those are tach numbers

billschroeder5842

Yeah, it sounds like a throttle blade hanging up. The "tap of the gas" and clearing it up is your give away. There is NO vacuum leak that will cause a near WOT situation then clear itself to normal.

Time to clean out your TB. Cleaner, rags and beer. 15 minutes and you are good to go.

aklim

It will take longer than 15 minutes even if we assume he has all th necessary gaskets. He'd have to take off the TB, disconnect all the connections and cables, clean everything and reassemble with new gaskets. This doesn't include cleaning the passages.

billschroeder5842

You are correct if you want to disassemble the whole thing--- which is doing it the "right" way.

My thought was if the blade is "hanging" was to leave everything in place and use a little cleaner and a rag and clean as much of the bores, blades, crevices....etc as you can. Super quick (hence the 15 minutes) and SHOULD get the blade free.

aklim

It's possible if you are doing what you mention, so yes. Good point