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Like any car you start with a compression test . That tells you about the Valves and Rings.
Always the first thing you do.
Nope not a scope A gauge A Manual Compression Test .
I suggest a Expert ( with a gauge ) because you don't most likely understand how to read a Compression Test > For example a low reading may be rings not Valves > so then a Wet Test is in Order. Oil in cylinders then retest > if it comes way up then its rings > stays down Valves.
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Most Likely the Rings and Valves are fine >>>> But that's where you start >> saves time and money >> Then you move on Vacuum Leak test > Injector Testing > Electrical Testing > Fuel Testing > Get the Idea ?
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