the p0170 code can be of 3 things, MAS (99%) of the time, vacuum leak or fuel pressure regulator i think.

I change my MAS recently and took 3 days for the CE light to go out.

Everything is fine cept the engine still hunts around.

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1997 Silver AMG C36
OEM Advantegarde Grille
OEM Clear Corners
W210 Blinking mirrors
Eibach/Bilstein Combo
Zender Rear Lip Spoiler