I've been having the same no-idle problem on my 84 4Runner.

I checked out the solenoid and it works.
I checked out the harness side and the signal from the emissions ECM to energize the solenoid wasn't there.

Thanks for the tip <img src="/forums/images/graemlins/cheers.gif" alt="" />

- seen in FOUR WHEELER mag July 2006 & OFF-ROAD mag Feb 2007 -
'84 4Runner ARBed 5.29s F&R,4.7 & 2.28 t-cases,hy-steer,BudBuilt skid,30spl Longs,36" TSLs,Chevys

'83 P/U, Buick 231 V6,Holley 4 bbl,Weiand intake,Downey headers,TH350 w/700R4 gearset