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'83 944 Suddenly Erratic Idle

  • 1983
  • 944
170 000
San Antonio, 

I have an ’83 944 that I’ve had since ’84 and I do most of my own work on it. At 170,000 miles, it has never run better. About 3 ½ months ago, I replaced the spark plugs (Bosch Platinum+4) and plug wires (Clewitt Engineering), distributor cap and rotor (Beck Arnley), and air filter (K&N). I borescoped the valves and pistons (through the spark plug holes) and they’re all clean, with just a thin layer of carbon.

About 2 weeks ago, the idle went wonky. On any given drive, it will idle rock solid at one stop and vary by +150RPM at the next stop. It may idle perfectly for several stops and then idle wonky for several stops. I’ve not discerned any pattern. Off idle, it runs perfectly.

Any ideas?

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