hey guys im looking into buying a 96 350 crewy long, and when i fire it up it runs real rough for few seconds do they all do that? he also says its got a slight miss in the firing line somewhere, injectors and gps done recently, what else could cause this, he also said sometimes it doesnt build boost, but after some research i hear of this back pressure sensor? im an idi guy upgrading to turbo any help appreciated thanks in advance

 

When cold it is normal to get a bit of a romp but not run rough...

Slight miss could be many things, wire harnesses, injector issue... need to get a scanner on it to really see.

Boost could be the exhaust back pressure valve, could be up pipes, could be turbo... Hard to say without more info.