H3 stock Air intake, Air pump, mass air flow question

[midnightgravity]

Ok so my H3 is losing power on acceleration. The moment I go up hill, rev. the engine, I get kind of a Loud rev. sound or vacuum or suction sound as if its trying to breathe. As soon as I wanna hit the gas, the same thing happens as if I lose power on acceleration.
I inspected the entire air intake system, even cleaned the throttle body for a second time along with the mass air flow sensor. Took apart the air pump to inspect it. and Nothing. . I lose power on acceleration. It changes gears correctly and I can reach highway speeds.
Another thing to note before this all got bad was about 1/2 a year ago my engine on cold start up would get this high pitched vacuum sound that eventually got louder over time. Now it's very noticeable on cold start up. It stayed noticeable for a while before this all started..
I'm kinda curved on this one as I'm also wondering if it has anything to do with the fuel pump or fuel filter also. What are the symptoms of a bad air pump or air check valve?
My guess is that it's the Air pump, if not the Air check Valve.. . Before I go out and spend money. I wanted to hear peoples opinions on what it may be. . . Or if this has happened to anyone yet. . .

Here's what I've had fixed so far on my 2008 h3 base.

- Rebuilt Transmission
- New Water Pump
- New Fan Clutch
- New Thermostat
- New radiator Tubing
- New tensioner pulley
- New belt
- New Alternator
- New o2 sensors
- New (refurbished) Mass Air flow sensor
- New K&N Air Filter
- New 18 inch h3 rims (not calibrated yet)

 

[digglesworth]

Intake manifold? I've heard them getting cracks in them or even the bolts being loose causing it to not make a good seal causing a leak... Might be a spot where the sound is coming from.

 

[Best4x4]

Is the hose going from the pump to the air box in good condition with both ends sealed good? My 03 Series II Discovery had a similar setup and the hose ends would get brittle and break causing an air leak. Just something to check.

 

[USMC_TOP]

I was thinking the same thing Diggles.......