Idles fine but stutters and sometimes shuts off when under acceleration?

So, my car recently started sputtering and lugging when I go to accelerate and is worse when going uphill. The symptoms are getting worse and now it’s basically not driveable. I have replaced the spark plugs twice in the last year; the first set were cheap ones off of Amazon that I found one of them arching one night due to a crack. The new ones are Bosch double platinum, way more expensive ones than I wanted to buy but did anyway, so I didn’t have to rebuy them again and seem to be holding up just fine. I replaced one coil pack, the other two were fine (at the time anyway) and all the plug wires have been replaced. I have replaced the front exhaust manifold, fuel rail (I’m a short woman so I climb up under the hood to change the back spark plugs and accidentally stepped on it and broke it). We welded the back portion of the exhaust due to a leak and replaced the fourth gear hub because the splines were stripped out. I’ve replaced the o2s and I think that’s about it. Any help would be very much appreciated. Oh, and the check engine light is not on there’s no point in me hooking my OBD two scanner up to it because it’s not throwing any codes.

The car listed above is a GT model.