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Hi. First of all, your symptoms sound like a failing main fuel pump (located under the rear seat, outside the car). It provides enough fuel for low rpm, but the combination of higher rpm and a heavy load requires too much fuel for this pump, and the engine is fuel starved.
Alternatively, have you filled your fuel tank to eliminate the possibility of a broken transfer pump (also known as in-tank pump, or pre-pump)? This pump has a small hose inside the fuel tank, and when it leaks, the engine is fuel starved when the tank is less than half full (symptoms disappear when the fuel level is higher than the hose inside the tank).
That said, and because of the strange terminology you used, is this a non-U.S. market car with a carburetor, rather than fuel injection? Your reference to switching to webers implies that, and a carburetor has the only "plunger" I can think of: the acceleration plunger on old carburetors to enrich the mixture.
There is no plunger in the Air Mass Meter (maybe the "air mass part" that you mentioned), in fact, no moving parts in the AMM: there's a wire by which air flows and it measures air flow by how much the wire is cooled (by changes in its electrical resistance).
There is a flapper in the Idle Air Control device, but that has nothing to do with engine function at speed -- it only affects idle.
The only other thing that has a moving part (other than the fuel injectors themselves, ha, ha) involved in the engine performance is the Fuel pressure regulator -- it has a diapragm (a "plunger" of sorts, maybe?) that is affected by manifold pressure -- and it might be limiting your fuel pressure to a point where your engine is fuel starved under a combination of high rpm and heavy load. The mechanic might have tried to describe a defective regulator to you?
Or else, he's giving you double-talk to fleece your wallet -- otherwise, the terms you used (from your mechanic) make little sense.
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