if you're late to this post: I put in a new catalytic converter and rebuilt the engine. Today I put in the acdelco EP381 pump. This is a higher output pump and my gauge finally went up to 12psi for the fuel pressure. I also put in a 160 degree thermostat and went on a test drive. The same thing is happening. Under load, the manifolds turn red. Now what?...... to be continued!
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