One day, quite a few of us were tasked with missions to resupply Quan Loi in our C-123 Providers. The weather was not too bad as we broke out on top at approximately 1500 feet. I flew on top to the general location of Quan Loi, but could not see a thing except the clouds that we were flying over. I contacted the Army controller and found out that the runway was overcast, with the cloud height above the ground at 50 feet.
We scrambled towards the aircraft and I headed straight for the cockpit. The flight mechanic fired up the APU (power supply). As I got into the cockpit, I hit the starter switch for the number one engine. Nothing happened. I called back to the flight mechanic and asked him if he had the APU online. He said yes he had it online. I tried the number one starter again with no results.
After landing, I noticed a truck on the side of the ramp and an individual waving at me. I taxied over to where the truck was, swung the airplane around 180 degrees, and with reverse thrust started backing towards the truck. I started through the aircraft shutdown procedures and when I pulled the mixtures to shut off, and as the number one engine came to a stop, I could hear a hissing noise similar to escaping air.
After liftoff, and initial climb out, everything was still performing as expected. We entered the clouds about the time of gear retraction. As soon as the gear was up, the number one engine started surging and the number two engine started backfiring. I briefed that we would continue straight ahead to the ADF and return for landing. I looked down at the ADF indicator and it was rotating continuously.