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The idle would slowly creep up, so I replaced the Throttle Position Sensor. When I restarted it, it shot straight to 3000 RPM. If I remember correctly, this is too high for the choke. Could there be a vacuum hose off some where??
Also with it being an 87 check for cracked hoses. They may look ok but be cracked right along the ribs. I did that on a few lines when changing the carb on my 4.2 when I had the 4.2 in there.