O2 sensor or not?

Sounds to me like it may be an O2 sensor. When you first start the car and its cold it will run in what is called open loop. This pretty much means it runs off pre-set parameters until the vehicle is warmed up to a certain temp. During open loop the O2 sensor signal is ignored. It will then switch to what is called closed loop and run in closed loop until the car sits again and is started cold.. Once in closed loop the car's computer will look at specific values from various sensors (including O2 sensor) and adjust fuel, spark, timing, etc. accordingly. So when a car starts to run rough only after warm-up, the O2 sensor is usually the culprit. A clogged fuel filter will cause the car to run rough all of the time and the same goes for fouled or worn plugs or damaged plug wires. The O2 sensor may not yet be completely dead, but may be on its way out causing it to run rough only some of the time. (A bad O2 will cause a check engine light)

A bad O2 sensor can make the car run too lean, since the computer thinks there's not enough oxygen and adds more air. It can act erratically because it's probably full of junk and giving intermittent readings.

Don't let some shop rip you off for $600. Autozone will sell you some factory originals for $80 or $90. You can usually get them out with a box wrench slipped over the unplugged wire.

impossible that the o2 sensors are in charge. they're only responding to the engine working circumstance. To have black smoke the gasoline rigidity might want to be too intense, additionally very uncommon on ford products. The DPFE may well be a step interior the marvelous direction. This sensor video exhibit contraptions EGR device and a caught open EGR valve ought to reason the listed warning signs. i might lean extra in the direction of this section than gasoline pump or O2 sensors. extra specifics on the particular problem code numbers may well be powerful. good success!

A bad O² sensor would trigger a check engine light. A fuel filter wouldn't wait until it was warmed up to start having problems. If you have a mechanic you trust, take it in and have it looked at. Could be one of a number of things.

Don't change anything. These people, I gather they are not "mechanics", who can diagnose a problem and tell you to buy this part and try it,"it don't cost much" then buy another and try it.

Find an honest shop, if thats possible, who will read your trouble codes and tell you the problem and what it takes to fix it. I don't understand the check engine lite being on. If someone read the codes they should have turned it off.

I don't know if you are mechanically inclined but it may be a do it your self job

o2 should turn the check engine light on check stored codes a fuel filter is the easiest,cheapest and if you don,t remember replacing it it needs it

it could me many problems like bad sparkplug wires bad spark plugs or the spark plugs arnt gaped right or like u said ur o2 sensor or fuel filer could be even ur bands for ur transmision that will cause it to buck.or ur fuel injectors could be getting clogged an not spraying right

doesnt sound like an o2 sensor to me but why not replace it and see...its cheap and easy......sois the fuel filter