Run a bottle of RedLine SI-1 Complete Fuel System Cleaner, ... not the other brands.

I have had slight idle issues and mixture issues with CIS & CIS-E systems many many times, tried so many things to make my cars run properly on good premium fuels, but the injectors tend to dribble at low flow rates eventually and need cleaning. This always seemed to happen before 50k miles.

After trying so many solvent-based cleaners (including the stuff that they sell at the Mercedes and Audi dealers) I tried the RedLine stuff, detergent based they say and not corrosive to the bearings like the solvent-based ones, it worked. My '91 300TE went from an occasional miss at idle and slight hesitation with part-throttle increases, to clean and responsive (in less than 100miles). IIRC that was in 1994 at around 50k miles on that car, I had already had the dealer try everything including walnut-blasting the valves for carbon, replacing the fuel distributor, coil, wires and plugs, running the (Chevron-Techron) Mercedes fuel injection cleaner. Nothing worked.

I'm not connected with RedLine, but do like this product and have run it as a maintenance fluid in all of my gasoline cars/boats/etc. since. Worth the $12 to try IMO. Dribbling injectors at idle will not give you clean exhaust.

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Gone to the dark side

- Jeff