It could also be time to clean your injectors.

The easiest way is to use the "double-dose" of Techron Fuel Injector Cleaner in less than a full tank of fuel. After warmed up try and drive the car hard and into higher RPMs repeatedly.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)