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several things can cause restricted performance...anything from low circuit sensors,to malfunctioning modules...you must read the ecu code and pin point nthe issue..
This is indeed a skill rating of extremely high. Unless you have the experiance, I respectfully suggest that you have another mechanic perform this task, respectfully speaking.
I had the same problem. Restricted performance and running rough at 3000 RPM. I have an OBDII code reader and found that the problem was in the air mass flow sensor, which is just after the air filter. I pulled this out and found it was dirty and had butterfly wings in it. The last shop where I had the oil changed replaced the filter for me but put in the wrong size. Close but no cigar. Bought some *** Flow Sensor cleaner at auto store and fixed the problem. Get an OBDII reader with the ability to erase the codes. Comes in real handy.
They aren't just gimmicks. Some do work. All they do is change certain key parameters of the engune. Remember the manufacturer of th car has to share some of the performance for better fuel mileage. Aftermarket performans chip makers don't care how log your tires last or the engine or trans longivity. If you get one get one from a performance supplier with a good name. Nody I know of will stand behind any damages that may result. Good luck
Anything can cause the check engine light to go on from a loose gas cap, to a transmission issue. When the onboard computer detects an issue, it will restrict performance so as to not damage the engine any further. An Oil change won't affect this light. The only way to determine the cause of the light is to have the computer scanned with an OBD-II tool (Autozone does this for free) to determine the codes and cause for the light. You can also clear the light with the OBD-II tool, but if the problem is still there, the light will just come back on
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