Need some advice on my notchtop sr20

[Elliott]

Hello zilvia members. I need some experienced advice with some motor help. This is my first sr so bare with me.

I've owned this car a little over a month now (s13) When I picked it up, it had a really bad lag when steadily cruising and at about 4k rpm. I'm not sure on what my problem is. My motor is an all stock notchtop sr20 with a t28 turbo on it. Wirinf specialties harness.

I have replaced the plugs, swapped coils with another sr motor, cleaned my maf, made sure I have no boost leaks. I also replaced the Vtc because I read they are notorious for going out and I'm trying to keep this car. I also replaced the lifters at the same time.

This improved my problem slightly, especially when the car is cold it seems to run fine. When it warms up my mis Fire comes back. It's a jerky / fuel cut feeling.

I am about to swap Vtc solenoids with my friends motor. My next purchase (from what I think I need to fix my issue) is going to be my own Vtc solenoid but more importantly I'm going to do the injectors. I Think I'm going to do the 04-05 Subaru sti injectors because of easier accessibility.

I'm just looking for any helpful advice from someone who is knowledgable with SR20's, or someone who has had similar issues and hopefully figured them out.

Thanks for looking at my thread and any possible feedback