Just my take on the stock L-jet tronic system used on the 1st gen 280z's. Also note the high idle quickly drops down as the AAR valve closes off to a nice steady 800 rpm, a little higher when the AC kicks in which helps with the alternator voltage under the load of the fan motor. I forgot to mention the need to make sure no unmetered air sneaks in thru cracked rubber hoses, like the on on the AFM to throttle body. Also make sure the PCV hoses are in good shape, esp the bottom one which is easy to overlook.
