Gents,
Thank you for your replies.
The car has been sitting idle for over 15 years. It use to belong to the Royal household, so has only done 8,000km. Since I've changed the oil the pressure has made a difference. It still jumps up and down, but seems to be more consistent. The more I drive it, the better it is. I haven't changed the filter yet. That's next on my list.
Up to know the following is what I have done:
1. Disconnected the battery and re-connected it after 15mins. My understanding is that this re-sets the settings. It has made a difference to the acceleration. However, I've always driven a v8 Jeep, so not sure if the Merc is suppose to be as nippy. The car is fine in Sports mode, but find it slightly sluggish in E mode. May be it's just me.
2. Changed the oil. I also pulled out one of the spark plugs and they looked very old and tired.
Next steps:
1. Change the oil and air filters. Change all the plugs.
2. Take it to Merc to diagnose the idle problem.
Will keep you gents posted.
