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I find a lot of people don't realize that tuning can not fix a car in poor mechanical condition. I get countless PM's like "Hey, my car makes a loud knocking sound, can I flash that out?" or "My car keeps stalling, can EcuFlash fix that?"
If you have a stock or mildly modified car and you have running issues and/or check engine lights, EcuFlash is not the answer. In some cases, the problem causing check engine lights and drivability issues can be compensated for by tuning, but it is just a bandaid that covers up the real issue.
A car should be in perfect mechanical condition before tuning. No vacuum/boost leaks, good ignition components, good O2 sensors, etc.
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