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I'd back off to the fundamental components and possibilities.
I once had intermittant stumble and trouble that I isolated to that cluster of white wires grounding on the intake manifold.
Is the fuel filter new, pressure good (28lbs)? Maybe rust clogs the filter only under pressure for a few minutes. Never saw a press regulator fail except leaking.
When it's stumbling, is the exhaust rich smelling? That would again indicate the front temperature sensor connection.
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MPergiel, Elmhurst, IL '74 145e T-5 'Orange Alert'
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