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test air-flow meter (e-28)

Help needed with Fuel Injection Problems,

Does anyone know how to test an air-flow meter to see if it needs 
replaced.  I have flat spots and I'm running lean. My trip computer tells 
me I'm getting 28 mpg around town and 32 mpg highway!!! This is great for 
fuel mileage but lousy for power. I've replaced the fuel filter, o2 
sensor, new exhaust system, K&N air filter, rotor and cap, spark plugs 
and have tried adjusting the spring in the air-flow meter (The computer 
seems to adjust the mixture back to a lean condition when I adjust the 
spring in the air-flow meter). The car idles smooth, burns no oil, and 
has good compression at 150k miles.  I'm also thinking about replacing or 
back flushing my injectors, the problem may relate to multiple items.

Thanks in advance for any help,
Mark Conley
'87 535is
'90 Civic Si
'72 MG Midget