did a few hours of tuning on my car the other night with no problems

pulled it off the dyno and car drove fine for about an hour on the freeway

as soon as i started in stop start traffic, the boost controller would beep as if i was turning the car on, and randomly the check engine light would blink or stay on for a second or two. when the engine light would come on and stay on, the car would jerk like crazy and i would barely be able to drive off from the lights because its jerking so hard!

once im off from the lights, if i try mid throttle in 1st it will hit what feels like a wall, some sort of cut, 2nd gear same thing and then 3rd is normal.

this problem will randomly happen and then keep going until i turn the car off and cool it down. it will also start idling like crazy and start holding revs. so it will rev from 1000-3000 or even 5000 sometimes idling and when im driving it will rev on its own.

its throwing p0505 idle control system and p0136 (oxy sensor circuit malfunction bank 1, sensor 2) and p0170 oxy sensor circuit no activity detected.

in evoscan, im getting 0.00 voltage from the rear sensor.

any ideas whats going on? sounds like some crazy electrical gremlin in my car!