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Hi Mark, my name is Jason.
Have you ever seen this engine make full power under a load personally? If yes, how long ago was that?
How old is the fuel?
Steps 1 and 2 are to check engine compression, and check spark output with a timing light. Are you able to do those tests? Have those tests been done?
The engine compression and spark output need to be tested first before looking at the fuel system. Are those tests something you can do on your own? Did you have any specific or general questions for me, or would you prefer if I explained how we troubleshoot these in the shop, covering all bases?
Hi Mark. It looks like you read my last reply was this something you still needed help with?