I have a '78 280Z that had been stored for 7 yrs. We fixed all of the problems for cars that have not run for a long time. (fuel pump, leaking water/fuel lines, heater blockage, etc) We finally got it to run but it always stumbled when you first off. We replaced the computer, AFM, theromo-switch, cold start valve, etc. Trying find the culprit. What we discovered after close examination was a small hole in the AFM to TB boot. ((smaller then a pencil!) We grabbed a used one from the box of spares, installed it and Shazam! The car ran great. These old FI Z's simply will not run with ANY air leaks. FYI!:

That was an expensive vacuum leak!

Not as expensive as the incorrectly gapped spark plugs in my '92 4-Runner. (TPS, MAF, wires, fuel filter, ...)

  Wade Nelson said:

Not as expensive as the incorrectly gapped spark plugs in my '92 4-Runner. (TPS, MAF, wires, fuel filter, ...)

We had all of the parts off a Z that had given up on the FI and installed SU's. It was expensive in time but no hard cash.

Anyone experiencing similar problems with the FI bucking when you first take off in low, check for air leaks.