Hose that runs from the intake air filter duct to the manifold

Drain the fuel out and flush the fuel system, then it should run better.

On the 2.2 zafira, z22se engine. There is no MAF sensor. Which is why you can not find it.
Instead it uses a combination of the IAT (Intake Air Temp) and the MAP (Manifold Air Pressure) sensors.The IAT is the small plastic sensor on the side of the intake duct.The MAP sensor is just after the throttle body. You need to take the whole throttle body off to get at it.

The Intake Air Temperature (IAT) sensor is the same as the Manifold Air Temperature (MAT) sensor on earlier models. IAT is located in or near the air intake duct (click image for zoom).



Fig.: On 1996-98 vehicles, the IAT sensor is mounted in the rear air intake duct


Hope this helps (remember to rate this free answer).

MAF sensor is in the intake air duct between the air filter and the throttle body mounted on the intake manifold. MAF sensors are mounted directly to the throttle body.

email me. Check and make sure all vaccum hoses are not cracked. Basically anything connected to you throttle body, or intake that is made of rubber replace it. there is a small crack. happened to me this week. small air leak makes a difference. also if you can replace the intake with a cold air intake. Runs way better.

You didn't post the size of your engine so please pick the appropriate one:

3.8L

1. Relieve the fuel system pressure.
   
2. Drain the cooling system.
   

1. Remove or disconnect the following:
2. Negative battery cable
   

• Supercharger
  
• Thermostat housing
  
• Exhaust Gas Recirculation (EGR) tube at the intake manifold
  
• Engine Control Temperature (ECT) sensor
  
• Intake manifold
  

To install:

1. Install or connect the following:
   
   • Intake manifold with new gaskets. Torque the bolts, working from the center out, to 11 ft. lbs. (15 Nm).
     
   • ECT sensor connector
     
   • EGR tube to the intake manifold
     
   • Thermostat housing
     
   • Supercharger
     
   • Negative battery cable
     
2. Refill and bleed the cooling system.
   
3. Run the engine and check for leaks and proper engine operation.
   

4.6L
4.6L Engine

1. Remove the brake booster hose from the throttle body.
   
2. Remove the fuel pressure regulator vacuum tube from the fuel pressure regulator and the water crossover.
   
3. Remove the PCV fresh air feed tube from the camshaft cover and the throttle body.
   
4. Remove the PCV dirty air tube from the PCV orifice in the right camshaft cover and from the intake manifold.
   
5. Disconnect the fuel injector electrical connectors from the fuel injectors.
   
6. Remove the fuel injector wiring harness.
   
7. Remove the fuel rail bracket nut from the engine lift bracket.
   
8. Remove the fuel rail studs.
   
9. Lift and remove the fuel rail with injectors.
   
10. Loosen the plenum duct clamp in order to remove the intake manifold.
    
11. Remove the intake manifold bolts.
    
12. Remove the intake manifold.
    

To install:

1. Install the intake manifold, fitting the plenum duct over the intake manifold duct.
   
2. Loosely install the intake manifold bolts.
   

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Intake manifold torque sequence-4.6L engine

2. Tighten the intake manifold bolts in sequence. Tighten the intake manifold bolts to 89 inch lbs. (10 Nm).
   
4. Tighten the plenum duct clamp to the intake manifold. Tighten the plenum duct clamp to 24 inch lbs. (2.75 Nm).
   
5. Inspect the fuel injector O-rings. Ensure the fuel injector O-rings are not missing, misaligned or damaged. Replace the O-rings if necessary.
   
6. Lubricate the intake manifold fuel injector bores with light mineral oil (GM P/N 9981704), clean engine oil, or equivalent.
   
7. Install the fuel rail with fuel injectors as an assembly.
   
8. Install the fuel rail studs. Tighten the fuel rail studs to 80 inch lbs. (9 Nm).
   
9. Install the fuel rail bracket nut to the engine lift bracket. Tighten the fuel rail bracket nut to 89 inch lbs. (10 Nm).
   
10. Install the fuel injector wiring harness.
    
11. Connect the fuel injector electrical connectors to the fuel injectors.
    
12. Install the PCV dirty air tube to the PCV orifice in the right camshaft cover and to the intake manifold.
    
13. Install the PCV fresh air feed tube to the camshaft cover and the water crossover.
    
14. Install the fuel pressure regulator vacuum tube to the fuel pressure regulator and the throttle body.
    
15. Install the brake booster hose to the throttle body.
    

Hi!
It is the part where the air duct coming from the air filter housing connects to, right between the air duct and the flex hose that connects it to the intake manifold.
THIS IS A MAF SENSOR ADAPTER. THE SENSOR WOULD BE MOUNTED ON THE RECTANGULAR BASE AND FASTENED WITH THE TWO SCREWS


THIS IS THE IAC SENSOR, MOUNTED ON THE INTAKE MANIFOLD, BY THE MAF SENSOR.
A HELPFUL - 4 THUMBS - rating for this solution would be greatly appreciated. Thank you for using FixYa.

relief fuel pressure.remove air intake duct .the dohc engine remove the fresh air hose inlet hose from cam shaft cover.disconnect large under hood fuel line.near intake manifold support bracket on the left side of vehicle. look under vechicle where gas tank is there is a fuel filter with disconnects.

Try changing out the spark plugs...I had to get them straight from the dealer and my stalling went away.

Sounds like intake air system, look for cracks in hoses (possible intake manifold gasket) all vacuum hoses and connections. Make sure TPS and all filters are clean. Sounds like a lean mixture/flooding issue. Common problems with FWD is the Air Intake Hose, lots of flexing. Cracks form on the bottom and debris comes off inside over time(thus fouling the TPS downstream). Remove inspect carefully, If it is hooped you can fab one up yourself with PVC and some clamps and Aluminium Dryer Ducting. With the proper alignment and bigger airways you will boost your performance. The TPS can be cleaned with Carb Cleaner, replace the air filter and then test with a Vacuum Pressure Gauge install in line, directly off a Intake Manifold Vacuum port.

Try that and get back to me? I'll be around...