Quote:
Originally Posted by JOHN COOKSON
Could be a weak spark plug. Pull the spark plug wires one at a time while the engine is in the "low power" mode and note any changed in performance.
Could be a blocked tank vent. Would explain the 10 minute normal run time. To diagnose loosen the fill cap.
More as I think on this a bit more.
TRUE GRIT
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I did try the open deck fill and no difference. The fuel pressure gauge always around 2-3 psi