I have a 1997 E420 that has funny idle problems. It seems to be hunting for a steady idle. I have had the throttle body off and rebuilt by BBA and got it back. I reinstalled it but have the same issue with the idle. It has a new fuel filter, fuel pump, ignition modules, air mass sensor, new plugs and spark plug connects, etc.....no codes or check engine light.

Any ideas on what it could be?

__________________
Norm K.
'97 E420 Sport
'06 E350 Sedan
'67 Mustang Coupe
'70 F-250
'15 VW Jetta