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I took my vehicle(Ford Explorer V6 4WD) to auto zone and had them to check the engine code.(Which was O2 sensor needs to be replace)

My wife call the dealer they are say the vehicle is running "medium"  and to bring it in for a diagnosis for $150.00 not to include the repair.

The dealer said "that maybe one of the cylinders may not be firing correctly, but that 'm not sure you well need to bring it in"

I think I would know because the engine would be pulling.

My question is through-out your experience what do you think could be the problem?

The vehicle drives fine, but as I stated earlier the service engine light comes on and off.(It's on now, the last time it was on was two weeks ago)

Does your engine shakes? If it is not, follow the code to replace the part it needs. Some of the dealer will riff you off for one thing to another.

tony

Most shops will have a universal Check Engine Light Code Reader that can quickly and safely reset check engine light trouble codes. It should take about 30 seconds. Auto parts authority can detect was the problem of your car.