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so my 86 b2 is idleing odd
some times it will idle aroung 3000rpm and stay their consistantly
and other times it will sit at 1200 and fluxuate between their and 1800
what is it

my 87 when i got it would sit there and rev back and forth up to 2000 or so until it warmed up. when i swapped the motor i had noticed that when the guy before me welded the nerf bars on, he melted a vaccuum line going to the gas tank. i put a rubber hose with 2 hose clamps and it idles just fine from startup.

so the hose goes from the engine back to the tank
is it just a black rubber hose?

Recently mine was idleing at 1500-2000 RPM so I took the AIC and the throttle body off and cleaned them. They were both filthy and the AIC had a small twig in it. Two weeks before I went through a mud bog and so much mud got on my air filter that the next time I started it, the filter just riped in half because it wouldn't flow any air. Just something to think about or check.

the hose was a small hard plastic one inside the frame rails

mine 1988 will idle at 1500 until warmed then down to 500to 300 and die constantly will any one help i replaced the plugs and set the idle at 1000