Ok so I have a 2002 wrx, I recently put a turbo back exhaust and uppipe on, new clutch and streetlight flywheel, had a shop do the clutch, when i got it back had an abs light, then about 25 miles later the speedometer stops working. Took it back to the shop I guess the driver front vehicle speed sensor is bad. I also changed the spark plugs and oil recently, but i've pretty much had it sitting because i've been waiting for my muffler to come in, crazy loud with out it. So I get the muffler today slap it on, car seems to be running great, drive to school 45 min drive all seems good, drive home all good. When I get home I pick my friend up and hes asking me about how the car drives, so I accelerate pretty fast in first to show him. I didnt launch the car was already going at maybe 10mph, but when i hit 3500 4000 rpms the car just kinda shut off jerked a little bit then when i stopped at a light or anywhere it idled very rough like it was going to shut off. I guess I shouldnt have accelerated like that but now im worried about what the heck is going on with the car. Was that a fuel cut off? Could it have been because of the abs or traction control? If i lost traction could it cut the fuel? Or is it because I dont have a tune? Could the car have over boosted and cut off? Kinda scared to take it for a tune if thats happening. Also, I have a cel from the getting rid of the cats, so not sure if I threw a cel during any of this.
Ok that was a lot so sorry for the long, and that I had so many questions(that might be noob questions). Any thoughts or help pointing me in the right direction of the problem would be great. Again thanks for any help, pretty much everyone ive talked too on these forums has been amazingly helpful and nice, thank you for that!