[dhs.buckley]

Just thinking back to my Xh 5.0 v8, it had gas&fuel and it backfired and wrecked the airflow sensor,(ran very lean and was a bastard to start) maybe just try unplugging the airflow sensor as the computer for the fuel side goes to a full rich program without the airflow meter from memory.
it will run ok ,but it will be pumping heaps of fuel in.