2003 Chevy Malibu Acceration

If Andy Mohr a Chevy Dealership service department in Noblesville, IN tells you they cannot find out the problem and you catch them in 3 lies what should one do. They charged me $95 for a diagnostic fee. I was having acceration problems they told me CAT. I responded saying the same result happens without a Cat. They say remove it, I did and proved them wrong. Next they say MAF and they unplugged and claimed it would run ok.I respond no I did that, but I took there word on it and went to Autozone too pick up a new MAF. No result! Went back to Andy Mohr Service Department in Noblesville Indiana and had the shop forman go for a ride to make sure they new the problem. He responds your right the exhaust isn't the problem even though they say MAF now. Remember we are driving with no CAT so free flow with new MAF. So now I would be out $1000. The took me back and forth to work for 4 days too me they could not find out what was wrong with the car. Service Man told me they swapped out all the O2 sensors with new, but when I replaced my 3 month old O2 sensor I only hand tightened them and remembered to tighten it down when the service man from Andy Mohr said they swapped them out with new. Sorry to vent, but I had to get under the car and tighten down the O2 sensor that I hand tightened. He tells me now they need to dig into the engine. So I am afraid to let someone who has lied 3 times to do so. Anybody know what I should do. Someone told me to contact Zone Manager for Chevy. Embarassing for Chevy and Andy Mohr.I never raised my voice, just called them out on a lies.
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Things I have replaced are Waterpump, Thermostat, CAT, TPS, EGR, Coil Packs, Plugs, Plug Wires, Fuel Filter, Intake Manifold Gaskets (correct ones) & MAF.I just took it to a new repair man and he says fuelpump, but I checked it and so did Andy Mohr they say it was getting good pressure.
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Symptoms: Full throttle RPM's set around 3,000 and gradually move up. Acts like you when getting up speed like the parking brake is one (not litterally). You can kind of feel it missing when in idle if you set you hand on the upper intake manifold.I need some answers please