1994 voyager 4cyl air filter to intake manifold.

Check the fuel pressure. It will tell you if the pump, fuel filter, and fuel pressure regulator are all good. Fuel pressure is critical on fuel injected engines.

Check your spark plugs for wear or the wrong gap.

Another possibility is a vacuum or air leak. Check all vacuum hoses and the intake manifold gasket. The GM 3.8L engine is prone to lower intake manifold gasket failures. Sometimes the upper intake gasket, too.

You must remove the intake manifold.

THROTLE BODY AIR INTAKE HOSE OK

For 1994 Plymouth Truck Voyager 2WD 3.0L MFI 6cyl the MAP Sensor is located under hood, passenger side, upper engine area, end of intake manifold cover, mounted next to alternator on engine.

Hope helps (remember rated this).

There are several areas of possible leakage. One is the hose and plastic outlet from the intake manifold on the passenger side of the engine. The hose runs low, underneath the alternator. The plastic outlet cracks, the hose gets old, the clamps on the hose can also be loose. The replacement outlet from the dealer is steel, not plastic.
Another possibility for leakage is on the driver's side of the intake manifold. Underneath the air inlet is a metal cover on the end of the intake manifold. This covers the coolant passages at the end of the intake. Mine was oozing antifreeze..you don't have to pull the intake to replace this.
The other place for leaks is the intake itself..requiring removal of the intake. I've done this...I don't think it is that bad of a job. However, if you put in a new intake, don't forget to put in a pcv valve..it fits under a small cover at the right rear of the intake manifold.

Start from beginning at source line going through firewall which may be attached at brake booster, or back of intake manifold, then to back of controls. Take a piece of hose if necessary, hold it up to your ear and use it to assist in hearing a hissing sound, under dash on passenger side, in behind controls etc, it may help you pinpoint it.
Do any of the doors sound like they are moving at all?

The PCV valve can be located in several places. The most common location is in a rubber grommet in the valve cover. It can be installed in the middle of the hose connections, as well as installed directly in the intake manifold.

Once the PCV valve is located, make sure all the PCV system hoses are properly connected and that they have no breaks or cracks.

Remove the air cleaner and inspect the air and crankcase filters. Crankcase blowby can clog these with oil. Clean or replace such filters.

Oil in the air cleaner assembly indicates that the PCV valve or hoses are plugged.

Make sure you check these and replace the valve and clean the hoses and air cleaner assembly.

When the PCV valve and hose are in satisfactory condition and there is oil in the air cleaner assembly, perform a cylinder compression test to check for worn cylinders and piston rings.

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.

hi the mass air flow sensor is in the intake hose/tube between the air filter and intake closer to the intake manifold will have wires pluged into the side of it

the pcv valve is behind the alternator between the alternator and oil filter. when you remove the oil filter you can see the pcv in the intake manifold. best way to get to it is through the pass side fender under the rubber mud flap thats between the wheel and engine.