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idle won't return to normal 200 1980

i have a unique car with what i expect is a common problem. need a little advice/help.

its a 1980 wagon with a 1986 engine and computer. trouble is, when the car is warmed up (not too sure about during warmup), when i apply the gas, then let off, the idle wont return back to the normal idle level. it stays high, right about where it was before i let off the gas.

the cable does not appear to be sticking, and nothing seems to be loose, such as vacuum hoses, unless i am missing a hard to spot one somewhere, like the ones that are under the intake manifold.

any suggestions on where to start?

thanks to everyone who spent time reading, thinking, and/or replying!






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