When I depress the accelerator, it seams to have a sensitive & delayed response and so I end up "punching it". What could be the causes of this?

I am having some trouble starting my 1984 911. But the bigger issue which is likely related to the starting problem is that it cannot idle. It starts to stall, then surges and drops back down to stall, then surges again, etc. Every 5-10 cycles, it will stall, so I have to keep my foot lightly on the accelerator to prevent a stall. When I depress the accelerator, it seams to have a sensitive & delayed response and so I end up "punching it". What could be the causes of this?

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[Casey at Pelican Parts]

Most likely a vacuum leak, or unmetered air entering the system. If those items are OK, then the air fuel ratio needs to be set, and then idle needs to be set properly. If you still run in to the hunting idle issue. I recommend replacing the idle control valve.

- Casey

[Driven97]

Two additional total guesses:

The IACV is supposed to control idle. It's the gold can here:



Perhaps it's not functioning correctly, the electrical connections need attention, or it needs a cleaning (if possible, don't know.)

Next guess is the air flow meter:

http://www.iprimus.ca/~trauttf/temp/AFM/afm_body.jpg

It's got two fingers that slide on a track as a potentiometer, the more air flowing, the further the finger are swung across. The ends near the idle / full close section eventually get worn through and it doesn't meter correctly. My car is jumpy just off idle, especially noticeable rolling through a neighborhood in 3rd. It's not noticeable taking off from a stoplight though. It's not annoying enough in my car to bother, but I guess you can move the sliders in/out slightly to start on fresh parts of the tracks.

[Joe Bob]

Micro switch.