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?