Hi Maurice .
What plugs do you have fitted ,if Bosch replace with NGK.What Causes a P0300 Code?
Less Common Causes
- Low Fuel Pressure
- Vacuum Leak
- EGR system malfunction
- Internal Engine Problems (such as low compression)
- Faulty Coil
- Faulty Spark Plugs and/or Wires
- Camshaft or Crankshaft sensors
- Ignition module
First do a fuel pressure test and if found good do a cylinder leak down test .
Then any vacuum leaks should be checked ,if st fuel trim is +10 and over manifold leak .
EGR system also a typical problem to cause a P0300 code .
Engine condition check that cylinder compression is above 8bars and all even .
NOW IF YOU HAVE HIGH MILEAGE .
The most common issue for this engine to set a P0300 code is the timing chain has slightly streached and will need replacing ,if on start up you hear a slight engine chain rattle then this is your problem .
Check the above and if needed please get back to me with the reply button, and not the poor or bad service, this way i can get back to you or suggest another expert if needed.
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Kind regards Greg.