Just acquired a 1973 280 SEL with a 4.5 liter engine and great interior. When first started in the morning, the car has a high idle setting. Is this normal? It last until the engine comes to a normal operating temperature which is approximately 15 minutes. This is too long to wait. The next time, I tried to drive the car five minutes after starting the engine and noticed a lot of hesitation (looks like it was misfiring too)when you step on the gas pedal to accelerate. Is this normal for this model? Is there any adjustment that I could do? The car has 61kmi on the clock. The engine operates fine under other circumstances.
Thanks for your help.