98redstang

Welcome and what the hell is an allen supercharger??? haha. Never heard of such a brand.

massred98gt

my gues as to why you are idling rough is due to a vacuum leak. hook up a pressure gauge to a hose coming out of the intake plunem to check the vacuum at idle. should be around 20psi. don't know if a different reading is acceptable for supercharger apps though. oh ya welcome to the site!!

98redgt77

allen superchargers went out of buisness a couple years ago.the supercharger is based on the m90 like the thunder birds.I will post pics of my car and the supercharger tomorrow.I think i will either do a head swap rework the heads,cams,intake and tax time run a vortec,pro-charger.Thought about doing a cobra engine swap unsure what to do.