Help

Has anyone had this problem with their 350z, when i go to start up my car or while im driving, the TCS and slip lights come on and i loose power so i have to stop or turn off the car for a couple seconds and the problem goes away, it happens randomly every once a week. The codes i get are for my cat delete and MAF sensors. It’s the the rubber that goes in the gas pedal because i’ve changed it already, any clue? also have code c1131

 

C1131 is traction control. this is probably not related to your cat removal, but you did plug the O2 sensors back in afterward, didn't you? Even if there's no cat, the O2 sensors are required.
The traction control error could be caused by a speed sensor. there are four of them, one at each wheel. this affects the ABS, etc. it's easy to forget one when changing a wheel hub or brake rotor if you wanted to get it out of the way. it's worth checking out, possibly one came loose. this is just a guess but it's worth checking.
I would recommend putting the cats back on to diagnose that issue and isolate it. you might want to leave the cat on while you solve the other problem with the speed sensors.

 

Could it be a speed sensor, the speedometer reads fine, and yes the o2 sensors are connected fine just checked them out! unfortunately i don’t have the oem cats since im running long tube headers. But I’ll check out if any of the wheel speed sensors came out loose, hopefully it’s that. I’ve been dealing with this going on 3 months and haven’t found a solution!