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Do you have the model and serial number of the engine?
What is the brand of your engine?
Currently, we cannot call outside of the USA.
You wrote that the engine is missing under load, at what RPM is this happening?
Will the engine still make full power at full throttle?
Ok, are you getting any alarms with this at that RPM?
Have you already checked the spark plugs?
Removing the plugs and checking the tips of them will not void any warranty. I need to know if they are all the same color on the ends. This will tell me if the engine is firing on all cylinders or not.
Ok, that is a good sign.
When you turn the key to the ob position, does the alarm test beep?
Was the engine running correctly before the service on it?
Ok, what all did the service shop do on the engine? That should be listed on the invoice.
All shops have a different list that they will go by for a 100 Hr service.
Do you know if they replaced or serviced filters 8 and 20 in this diagram?
it is possible that they did not get it back together correctly. This would cause a lack of fuel pressure at full throttle. You will need to open it and inspect the assembly to ensure that it is correct.
It should go together like the diagram. If one of the pieces is not installed correctly, it will block the fuel flow to the engine.
does the invoice say that they opened and inspected the filters inside the VST?
Ok, this sounds more like an issue with the fuel. Have you poured some into a glass jar and allowed it to settle and then see if there are more than one layer in it?
Ok, is the water check streak, or tale-tell still pumping as it should?
Can you duplicate the issue at any time?