Join Date: Nov 2007
Location: Los Gatos CA
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Perhaps loosness in the engine harness where it connects to the valve cover gasket. On the inside or outside.
I had some injectors cutting in and out. I cleaned and worked over the connectors, spreading the metal for better contact. Got it up from five cylinders to eight.
Also with those miles, your injectors orings may be leaking. May be time to rebuild or put in new injectors.