1997 grand marquis Cylinder 4 misfire bank1 sensor 1, Lack of heated oxygen sensor

1997 MERCURY MARQUIS
150,000 MILES • 4.6L • V8 • RWD • AUTOMATIC
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ANTHONY MO
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1997 grand marquis Code read cylinder 4 misfire bank1 sensor 1, Lack of heated oxygen sensor
The car runs but stalls when accelerating, I recently had all spark plugs and the engine coils replaced thinking this would fix the problem but it did not.

The only other thing I noticed was that the muffler was hanging. i tied it up to not hang. Could this be the cause of it stalling when accelerating?
Nov 23, 2014 at 12:17 PM
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HMAC300
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no probably the misfire is one problem and the O2 sensor another. For misfires have a pro diagnose it as it can be any sensor/vacuum leak etc.
Nov 23, 2014 at 3:44 PM