Tons of great info here. I do have a question and hopefully you can help. I have a 85 325e. Car starts good. During warm up idle surges for about 30 secs then goes back to normal idle. Also when I'm decelerating down to a stop the rpm will go to about 1200 or so and just surges from about 800 to 1500 while stopped. I have to play with the clutch to calm it down to normal idle
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BMW E30 3-Series Idle Speed Troubleshooting (1983-1991) | Pelican Parts DIY Maintenance Article