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E28 Problems

Hello all.

I have a few problems with my 1984 E28 528i (Australian model) and was 
wondering if anyone out there has any advice.

1) The car runs roughly at idle when cold. To be more specfic, it is hard to 
start (takes 10+ seconds to start without applying any throttle), and when 
idling in drive (not in netural) I can feel vibrations from the drivers 
seat, but it seems to sound OK to listen to. The car has been recently 
serviced, and had  the fuel pressure regulator and a couple of vaccum hoses 
replaced. (the head gasket was aslo checked and found to be OK). It was 
still running poorly, and the dealer then adjusted the mixture and suggested 
the airflow meter box be replaced ($700+). So, is this a reasonble 
diagnosis? Are there any other possibilies that should be looked into? I was 
a little concerned as their reasoning about the air flow meter was that it 
was a sealed unit and hence unfixable,
but it had been opened some time in the car's life (by a previous owner), 
and not
because they had done any specific testing on the meter.

2) About 60% of the time, when the cruise control is engaged, the little 
orange check
control light in the dash starts flashing, and the "brake lights" warning 
light comes on.
Both the cruise control and brake lights appear to be working correctly 
though...

Thanks in advance,

Jesudas Mathew
[email protected]