1987 300 SDL runs fine in town and at road speed but dies when I pull into rest areas or fuel stops after sustained road speed traveling. How can I increase the Idle speed and will this help the situation. Current idle speed is in the 600 rpm range and it is pretty smooth other than the above problem. The engine temp is pretty consistent at 80 - 100 C with the higher temp occurring at full throttle on hot day with AC running going uphill. Thanks in advance for any help.

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87 300 SDL 278,200
85 380 SL 126,400
assorted domestic crap
79 240 D (sent on)

Hello Dserge,

Do a search on Injection Pump (IP) idle control, 603 engine and you will get plenty of answers !
Idle control on these engines is elecrical with a sensor on the flywheel and a solenoid "magnetic idle control" on the rear of the IP.

Danny