Jack_Frost

Hi everyone, I’ve been lurking here a while but first time posting. After some help please. So, as the title suggests, my IS seems to be suffering from very sluggish acceleration. Up to around 2500rpm the engine revs happily but I don’t get very much response at the wheels. It feels like a manual with a slipping clutch. Definitely more pronounced than normal torque converter lag. I’ve check the trans fluid level, which seems fine. I’ve read lots of other threads about poor response pointing to MAF sensor, throttle body, TPS, ECU reset etc. But as the engine itself seems to respond well it’s leaving me wondering whether it could be any of these or not. Any ideas? Thanks!