[s-cars] 93 S4 running weird/rough

[cuatro quattro]

Hi all,

Have a strange problem that I can't quite resolve with my 93 S4.

The problem started about 2 weeks ago and is getting more frequent/worse.

ok, here's the problem..

The engine would sometimes run very rough like if it's running on 4
cylinders instead of 5.  This happens all the time and is not boost or
engine RPM dependent.  It happens while idling too.  I'm not getting any
fault codes.  Sometimes the engine would just run perfectly without any
problems.

So far, I've replaced all the spark plugs and the O2 sensor.  Neither
helped.


any ideas?  Much thanks in advance.

David



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