my car is throwing a U1000 code, went through harness but after changing plugs, it pops, being said i am losing my mind from this car, need some 2nd opinions on what’s going on with this car. it has been tuned but it’s never done this before. and the only code now it’s been throwing is a pending u1000 and a stored u1000 code

U1000 means one of the computers isn't talking. There's like 7-8 of them so it's hard to say exactly which one is malfunctioning.

I personally would start by pulling and inspecting the spark plugs.