ok as soon as the car is at full warm up temp after doing the tune up on it (plugs & wires only) the temp gauge reads halfway and I start to rev it up and it does not go higher rpm's than 2k and the car starts to spit and sputter need help trying to figure out what is going on do i need a new cat. converter i dont know how old the one on it is just got the car 12-26-13 motor replacement is all i have done to it

 

here is the video

 

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