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San Antonio, TX
agree with #1.
Sounds like a faulty fuel sending unit,but sometimes the sender card will become contaminated at the top of the sweep due to never having a full tank,don't feel bad I'm guilty of it myself! try putting some techron fuel additive in a full tank and driving it.It might sort itself out if this is the problem.
The code definition sounds pretty vague.If it is a circuit code than it could be several things.And if it were an air fuel ratio lean or rich code than you need to diagnose further for a root cause.I have never replaced an o2 sensor for a lean or rich code,but auto parts stores ALWAYS sell customers on o2 sensors when they get these codes.Get us the actual code # and we'll help.
I agree with greg's,If the vehicle is equipped with an electronic throttle body what happens is the computer will compensate for any carbon buildup on the throttle body by holding it open passed this point,so when you take the memory away by removing the battery it wipes this predetermined value away and the idle quality suffers.The easiest thing to try is just cleaning the throttle body and then drive it.
Tell him to save the old parts and give them to you.They might have been damaged during bearing install or are just defective.Either way an honest mechanic will have no problem doing that.
there is a bypass pipe that runs below the intake at the rear of the water pump and exits the rear and is known to rust through & fail.Use a pressure tester and have a good look back there.
If it starts and then stalls the first thing that I would do is give the idle air control valve a whack with a wrench,I know not very scientific but it works.If the idle comes up then there's your problem.If not then I would hook up the scan tool and go from there.
If you have one of several parameters that are not met it can cause what you have.You'll need to hook up a scan tool that can view live data and have a look at your basic parameters like ect,iat,o2s11,o2s21,o2s12,o2s22,vss,tpv,tpmode.
I agree with goodguy's advice to check for loose connections.I personally have replaced alot of focus alternators that were doing EXACTLY what yours is doing due to an internal failure.
I used to see this all the time when I worked at a Lincoln/mercury dealer in New Mexico.Try cleaning the mass air flow sensor out.It is located in your air filter housing and has an electrical connector on it.Parts stores sell a spray can for it,but if you can't find the cleaner just use brake clean and blow it dry.There are alot of other possibilities,I'm just giving you the most likely cause and what I've seen ALOT of.