Jeep cherokee is almost undriveable stalls, looses power, sounds like its...

O

ouch

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...missing somewhere or fuel isn't? getting through, mechanics can't find anything but now telling me code 21 so o2 sensors, what now? Also my fiance towed someone with it about a month ago and the driver of the car in tow kept slamming the brakes on hard!! This is when it started. Any help would be much appreciated, very frustrating!!?
Jeep Cherokee auto limited 1997.
 
Run some Seafoam through the engine and do a tune-up including new O2 sensors. If that doesnt fix it, it might be the cat converter clogging up. The model year and mileage would help.
 
Stalling losing power, possibly carbon has been banged loose and clogged the exhaust in your catalytic converter.
Missing could be a loose plug wire, or possibly a cracked distributor cap if your vehicle model has one.
 
Stalling losing power, possibly carbon has been banged loose and clogged the exhaust in your catalytic converter.
Missing could be a loose plug wire, or possibly a cracked distributor cap if your vehicle model has one.
 
Stalling losing power, possibly carbon has been banged loose and clogged the exhaust in your catalytic converter.
Missing could be a loose plug wire, or possibly a cracked distributor cap if your vehicle model has one.
 
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