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Welcome bostonsports!!

"The car idles when warm from 750 to 3000 rpm's." go into more detail please..

moving to tech forum.. ;)
 

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ICV or ICS depending if it was an 87 shipped in 88 or an 88 line. If its early 88 then there is an ICV or idle control valve, if its late 88 then theres an idle control sensor. Either way just spray WD-40 in it
 
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