Hey guys,

I've had this problem for a while now, and I'm about to put it in the shop, but I was wondering if you could help diagnose this issue.

My '87 560SEL has always run a little weird after it sat for about 8 months, but lately it's been doing some strange, strange stuff.

This is all after cleaning the IAC valve, by the way.

-When I start the car cold, it idles at around 750, which is okay, at best, but once I let it warm up, it fluctuates at around 750 to 650, going up and down between the two.

-When I drive it around town, or any time in general, the cars idle lowers and the economy gauge goes to the middle, and sort of 'rumbles' when I hit the breaks (only when lowering speed between 25 to 10 mph).

-When warm, car shifts really hard into drive or reverse; I depress the brake fully every time, and always put it into neutral for about 4 seconds before I shift, and it still does it.

-There is a slight whistling noise coming from the left of the engine compartment when I first start her up in the morning, which makes me suspect a vacuum leak somewhere in there.


If anybody has any ideas, it is greatly appreciated.

(also, the idle problem could definitely be the ICU, but I've taken it out and the idle surges to almost 2000; I dunno.)


Thanks