The car has been running rough while idling for about 3 months. The power during acceleration it used to have isn’t there on the freeway. The roughness got worse gradually. Last night 2 minutes into my commute, it stumbled hard but recovered. This happened twice. When I got home 5 minutes later, the car stumbled and did not recover. I turned her off and restarted. I noticed it would start smooth and progressively get rough--earthquake type rough--within 10 seconds and would not recover and doesn't shut down. I replaced cap & rotor along with spark plugs (1 was broken), cleaned the ICV, and checked vacuum lines and rubber connections. I restarted the car, which was cold, and it was smooth but got progressively rough again like before in no time and my garage smelled like gas. I’m thinking it’s the O2 sensor. Any thoughts?

Best Regards,

Andrew

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sjsfiji

'87 W124 260E (DD)
98K orig. mi. @7/15
CLK 7-Spoke Forged Wheels
Neuspeed springs/Bilstein Sport
4/3 bump (F/R)

'97 993 Carrera
106K orig. mi.
Always driven like it's stolen