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I'll second the clearing of codes suggestion. Very different example, and maybe irrelevant, but here's a scenario that happened to me.
Charge pipe blew up on interstate. Engine RPM start bucking between 500-1500, car is shaking violently, I thought a part of the drive train broke. Throw it in neutral, coast to shoulder, realize it's not the drive train but something with the engine. Inspect, see blown off charge pipe. Stick it back on and it seems to clip in still, even though part of the flange around the clip is cracked and MIA. Start car, all sorts of codes and CEL, rpm still bucking violently. Try turning off and restarting car a few times, no go. Luckily, I had my ELM/BT code reader thingie with me, and used it to clear all of the codes right there on the shoulder. Start engine back up, all good. RPM normal, no more codes or CEL. Was able to drive it the remaining 5 miles to the house.
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