OBD readers tell you if computer systems and sensors have issues. Rarely do they tell you if you have a mechanical problem. The OBD reads a computer program, no matter if it's the auto parts store or your own personal OBD reader, they both work the same way.
We had an issue with a spark plug misfiring. What the OBD could not tell us was that the head gasket was leaking oil into the spark plug hole.
I have an OBDII reader that bluetooths to my phone , it will tell you a bunch of things including a vacume pressure meter. you can pinch off vacum lines and if your vaccume pressure jumps you may be able to narrow down where
a LP torch not lit can also help , you are feeding out fuel you place that where you suspect a leak may be and the engine picks up rpm
If, and that’s a big if. Vacuum leaks today use a smoke machine due to the number of vacuum lines. The old fashion way is inspect them, use a carb spray or propane method. But if they are leaking then I suggest mass replacement. Vacuum hose is cheap and only a few sizes needed. Be aware of cracked fittings while doing this.
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