My 87 GN is hard to start COLD,then when it does start it idles up and down ,up and down,up and down. It will die until it gets warmed up and then idles fair. The car has sat about a year but it was doing this before I parked it to restore it. My original MAF went bad so I bought the Tomco and it really ran funny so I bought a reman from Conleys. If you unplug both mafs it idles smooth BUT the idle is a liitle high. I don't think the IAC is even touching inside the T.B. the pintle still looks brand new (clean with no carbon).No codes showing. :dunno: Maybe the IAC needs adjusted but don't know how.