Thanks hi , i have 2001 windstar ford,i went to auto part to get the code on check eng light.so come out with,mass flow sensor i clen it.still the same. plase help.also the rpm go up and down

codes are OBDll and are available online free
P0174

• Intake air leaks
• Faulty front heated oxygen sensor
• Ignition misfiring
• Faulty fuel injectors
• Exhaust gas leaks
• Incorrect fuel pressure
• Lack of fuel
• Faulty Mass Air Flow (MAF) sensor
• Incorrect Positive Crankcase Ventilation (PCV) hose connection
• P0171
• Intake air leaks
• Faulty front heated oxygen sensor
• Ignition misfiring
• Faulty fuel injectors
• Exhaust gas leaks
• Incorrect fuel pressure
• Lack of fuel
• Faulty Mass Air Flow (MAF) sensor
• Incorrect Positive Crankcase Ventilation (PCV) hose connection
• P0102
• copy and paste
• https://www.justanswer.com/ford/2dnqt-98-windstar-dtc-p0102-sitting-trouble-code-mil.html

copy and paste
https://www.justanswer.com/ford/8kg47-ford-windstar-code-p0302-p0305.html

P0453
copy and paste
https://www.justanswer.com/ford/3qxa3-getting-po453-code-evap-pres-sensor-high-99-windstar.html

see if you can get the codes out of computer that would help you greatly then post on here what codes are in system.most of time its mass air flow or cam sensor.good luck,mike

Did you mean the mass air flow sensor ! hear are some problems that accure. So, MAF failure will create a wide variety of performance and power problems. These may include: hard to start vehicle; starts and immediately stalls; hesitation in engine; rough idle; running very rich or very lean fuel mixture; or "hiccup" when accelerating.
If you suspect MAF sensor failure and the check engine light is on, a auto parts store can read the computer code for free as long as light is on with a code scanner or even sell you a code scanner. An auto repair shop can also check the codes fairly easily. But if the check engine light is not on and you suspect MAF failure, try the cleaning the maf sensor first. good-day !.

Fuses, relays, Mass air flow sensor, crank sensor. Most likely your check engeine light is on, check for codes and descriptions, this will point you in the direction you need to go.

have u done a tune up and fuel filter if not it would not hert and would be my next step....hope this helps

the fuel pump relay is weak

P0171 indicates a lean condition. The most common cause of this is a defective mass air flow sensor. Also check if any vacuum leaks. P0174 OBD-II Trouble Code

Technical Description

System Too Lean (Bank 2)

What does that mean?

Basically this means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exhaust.

Note: This DTC is very similar to P0171, and in fact your vehicle may show both codes at the same time.

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Thanks.

#1 is the egr position sensor #4 Is for single cylinder misfire so this could be the coil or a bad plug or wire ..but with fords should check for a vacume leak that can cause a misfire to .....#2#3 are 02 sensors before i would change them i would check the mass air flow sensor ..Hope this helps

have your idle speed sensor cleaned,also checkd the air flow sensor located in the air cleaner housing,you best bet is to have it scanned for PCM soft codes(codes that wont turn on the check engine light on)

P1143 Air assist control valve range/performance

Could Be your mass air flow sensor. Start there.