National Auto Repair and Smog

I took my car to find out why it was havening trouble with the engine they told me it needed new fuel injecture because they were leaking gas in to the engine and that i needed to change two of them as soon as possible then they did an oil change and a tune up and my car still had a problem accelerating and they charged me 300 . i took it to a second mechanic he checked the injectures and showed them to me they were fine except for one that simply needed adjusting . then he checked the engine it was a problem with the air in take we replaced the part and it was fine these people are fake and shouldn't be trusted .