Fuel Pump Question?

Hello Id like to know if these are symptoms of a colourless fuel pump, When I first start the car it take up to 15 secs to finally start, when I crack the throttle it stumbles until about 2000RPM's consequently seems somewhat fine, theres still a stumble but its smaller number noticeable, I enjoy a scanner and when the engine gets melt it reads that I am running lean. Also when contained by gear, if you bump the gas to accelerate near anything more than 1/8th of a pedal, she bogs down for a second then picks up. At Idle I own a steady shake as well I dont enjoy a pressure tester so I cant say for sure what Im running PSI knowledgeable but I do know I grabbed the pump from my local junkyard due to personal issues which resulted within low funds, Car was sold to me none running due to bleak fuel pump but I think I put a weak/bad one vertebrae in. Any thoughts?
91 Ciera 3300V6
Tune up, fuel/air filter, P.wires, FPR, Coils, Ign. Module, Vac lines, Crank sensor, MAF sensor, O2 sensor, TPS, IAC, Injectors.. adjectives changed, 5 month project so far

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Answers: http://www.aa1car.com/library/vacleak.ht...

First thing that come to mind.
Good luck

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Sorry I can't help you!

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