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You don’t need all those ground wires.
Simply run a 2awg wire from battery negative to the engine block. I’m betting it solves all your problems.
The chassis is not a good ground path, and by adding all those grounding wires, you’ve created ground loops, which increase the resistance in the ground circuit.
One 2awg from battery negative to block, and one 4awg from intake manifold to chassis. The rest you can get rid of or tie back to the block.
No engine harness should have ties directly to chassis ground outside of an aftermarket four or five pin ignition coil harness. All other engine harness items should ground to the ECU, and the ECU has it’s own chassis ground. This should be tied to the engine block or the negative battery terminal.
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