1989 260E

I have 3 or 4 leaky fuel injector seals that I plan to replace this week. Could they be contributing to somewhat rough idle -- with the car continuously trying to adjust fuel/air mixture?

I have an all-new and Position Sender Unit, distributor cap and rotor, STI spark plug wire set and properly-gapped Bosch copper plugs. Fuel pump relay, OVP and ignition control unit are all fine.

I have always had a slight rumble at 500-600 RPM idle, which goes glass smooth at 1000+ RPM (at which point I can't tell if I even have an engine). My assumptions are the leaky injector seals, or perhaps a dirty fuel filter (which I also plan to replace this week).

Any thoughts?

__________________
2008 E350 4matic / Black/Anthracite

------------------------------------
Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black