Agentburns89

So back story, bought the legacy used,replaced timing belt, gears, crank and cam poisoning sensors.car was finally running great. I could feel wires dangling down under dash when I drove. Climbed under dash saw two green connector plugged them in and started car. CEL came on flashing quickly. Turned off csr, disconnected green connecters restarted car and the idle had gone from incredible to incredibly rough. It nearly wanted to die a couple times. It almost sounds/feels like it was misfiring but not sure if that's it. Could really use some help.

Just got a 96 legacy. Looking to do lift and tires but don't know the best direction to go in. I want to go big but not ridiculous. I saw someone say something about forester or outback struts and springs, how effective/easy is that swap to do? I've also seen lift spacers and king springs. Again just looking for advice.