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possible bad thermostat or cooling fan

might try a harder brake pad, though it may be somewhat noisey

electronic fuel injection specification is 13-16psi

what is the code?  sounds like they are looking to cover all the bases.  a reputable shop can do a smoke test and pinpoint the leak.  seems like it would be one of the three...

check the air intake hoses between the air filter housing, make sur the clamps are tight and that there are no air leaks between the mass airflow sensor and the throttle body.  sounds like an air metering problem to me...

check your cabin air filter

usually the replacement fuel pump comes with a new connector harness...it is fairly common that the original connector gets burned...seems more common on chevys to me

check your sway-bar bushings...maybe a little lube

i've dealt with alot of gm fuel pumps that are noisey yet still work fine...check fuel pressure...sometimes a fuel filter that needs replacing can cause the fuel pump to work harder causing it to be noisey too.

power steering pressure sensor