My '87 SPFI has a wonderful (&*%$# !) new symptom. Unpredictably, the idle will get super lumpy and fluctuate between 100 and 1,200 rpm, but ususally on the very slow side. When it evens out, and it does this without notice, what sounds like additional air is being adnmitted. to the intake or throttle body. When this air sound cuts out again, so does the idle and we are back to the slow lumpy stuff. This cycle repeats itself in no set pattern.

 

Is it the idle air control solenoid?

Something that controls the solenoid?

 

Need some help here to stabalize the idle- smog test due at the end of te month!

I'd say it's the Idle Air Control solenoid like you suggested. A search on 'IAC' or similar should yield quite a few hits.

 

it's been recommended by some as being something that should receive occasional cleaning.