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Last fall my car was shaking and I had to press all the way on the gas for it to go at least 30, and would not go over 50, also the service engine light was flashing and it looked like smoke coming from the car.  I took it to the garage and they fixed it saying it was the fuel injector.  A couple of days ago the same exact thing happened.  I took it to another garage today and they couldn't find anything wrong, he ran a diagnostics test and even test drove it.  If anyone has had this similar problem or knows what to do please reply.
Thanks