2007 Saturn Vue engine problems

My truck only had 60,000 miles on it. While driving home I began to noticed some smoke coming from the hood of the truck. Being only a block away from the house I proceeded to the stop sign. I was going to park and check it out thinking that it was something minor. Just as I was about to turn the corner the unthinkable happened. While at the stop sign the smoke quickly ignited into flames under the hood of the truck. I quickly pulled over in front of my house.

My key would not come out of ignition, had to drill out ignition cylinder and replace housing also. Had to get a mechanic to key the cylinder and now the lights, A/C, and radio do not work after engine starts until it runs for about 8 minutes. Then everything works, but the check engine light stays on, the engine runs good, until it sits parked overnight and have to do it again the next day. Also had to replace the alternator. Still doing the same.