Recently picked up a 6mt rev up sedan to build as a drifter . It has higher milage(205k) but previous owner kept up with maintenance. I've had 2 G's before and a couple 350z's and this G just feels sluggish on acceleration with some hesitation middle range rpms. Example: 3rd gear wot and feels like im going no where. Recently the previous owner during (Mother’s Day) put in coil packs (NGK) and camshaft position sensors (OEM/Hitachi), Crankshaft Sensor(OEM) and the sparks have 15k on them -NGK iridium. Also Replaced valve cover gaskets as well.

So far I have taken out the k&n intake cleaned the whole setup inside and out then replaced the filter . After I then did a idle relearn . I ordered a new maf sensor and throttle body w/ sensor that should be here this weekend that ill try to replace next and see if it fixes it. The only error code im getting is P0057.

Mod wise the car has just a z tube and k&n flat filter . Mishimoto oil catch can . Megan catback and y pipe , action clutch light flywheel , stage 2 Kevlar clutch with stronger pressure plate (however I noticed it has clutch chatter and high rev shifting isn't clean has slight grinds)

Im pretty much at the point that if the maf and throttle body doesn't fix the issue I might start looking for engine replacements . Any help would be greatly appreciated yes ive done searches and just can't quite find what the issue could be .

 

For starters, I'd try to fix your current P0057 code. That, and an ECU reset would not hurt.
I would pull the plugs and inspect. They will tell you how the engine is running (rich, oil burn, lean, etc.) I had a 05 5AT with 250k and the previous owner put one step hotter plugs, and it wasn't holding power in high rpm. I put OEM heat range plugs in and it was much much better.
With that high mileage (and rev-ups being known for oil consumption) perhaps the cats are clogged/clogging up and restricting exhaust flow. I'm not a fan of K&N or any oiled filter, as they don't seem to filter as well in my experience compared to paper filters. The difference in power is negligible vs dust getting into the engine.

 

Did the ecu reset no more codes at all and drove it for a bit . Barley will do a burn out with vdc and traction off . Ill have to try and inspect the plugs and see what their status is. Have had 2 350z's 2 g sedan's previously and this thing just feels tired and worn . Currently searching the net for a rev up swap to throw in and just ditch the slug im dealing with now haha

 

A compression test and maybe a leak down test is probably a good idea too

 

This exactly.