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3126B intermittent power loss

The CAT 3126B in my RV loses power intermittently. It can happen at any speed. The check engine light comes on, and power is reduced, always twice in a row, back to back. I usually lose 10-15 MPH. If I don't let up off the throttle, it will repeat. A CAT service center in Nebraska replaced the GP sensor (2244536), but it did not cure the problem. I have changed my fuel filers several times, and my air filter. This service center said it might be the HUI (high pressure fuel pump) and/or injectors, but told me I would need to wait for a more definitive failure. The RV is unsafe to drive in my opinion. Any idea what the problem might be?