Need Ford help

[bumpster]

I know this is not an off brand forum, but I am at wit's end. 85 F*@# half ton, in-line 6, put old style carb on about 3 yrs ago to eliminate the last of the smog stuff. EGR is capped off and lines are plugged. All was well till suddenly it started to run way too rich, won,t idle, blows black smoke. If I take the brake booster vacum hose off, engine speeds way up and smooths out. Why does this seem backwards to logic, and what am I not finding?
Any ideas other than the obvious{burn it}, would be much appreciated. Thanks in advance.

[Eddie H.]

It sounds like you need the carb rebuilt. The needle valve in the inlet may not be sealing properly and allowing the carb to flood the engine with fuel. By removing the brake booster hose, you're creating a big vacuum leak and leaning out the fuel mixture is the reason it runs better that way.

[krazy_texan]

best fix is to drive it off a cliff, lol

[Tx Firefighter]

Originally posted by Eddie H.
It sounds like you need the carb rebuilt. The needle valve in the inlet may not be sealing properly and allowing the carb to flood the engine with fuel. By removing the brake booster hose, you're creating a big vacuum leak and leaning out the fuel mixture is the reason it runs better that way.

gospel...listen to the man.

[bumpster]

O.K., I took the advice to heart, replaced carb. with a rebuilt holley unit. GOOD CALL, truck now idles smooth{for a f$#d}, and is back to it's primary duty of taking my 90 yr old dad to fishing holes. Thanks guy's.