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Adam,
You may want to check the Air mass meter (flow meter) with an ohm meter. You will have to look up which terminals and what ohm reading. A bad flow meter will often cause idle bounce in your FI system, esp when cold.
Your system also has a temp sensor somewhere on the engine that tells the computer what the engine temp is. YOu may want to test this as well. (sorry I dont know where, I have an SC with CIS)
You may also want to look at the idle regulator. This will usually cause stall when cold and strange idle behavior all the time, however, can act like what you are experiencing when it first starts to go.
The battery terminals and alternator are also suspect since your system is pretty much totally electronic. The voltage drop which occurs at cold start up can make the FI system behave strangely and if there is some other prob that compromises the voltage already, this can cause such a problem.
Make sure you are running light enough oil for the cold starts (if its really cold), as oil that is too heavy when cold will accentuate this voltage drop.
Hope this helps.
Nick.
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Nick Shumaker
1982 911SC Coupe
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