2004 SRX Loss of acceleration

I just purchased 2004 srx in November 16. I was driving home about a month ago and the radio flashed service engine soon and would not go pass 40mph. I took it to local Auto zone and was told new throttle needed. I just purchased new throttle and some expensive pig tail from dealership. Im still having the same freaking issue no acceleration except now its not even going 2mph. I need help asap. If this many people are having this issue then new parts should be covered free of charge.
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