So it happens when its on mid-throttle?
Youve probably already done this but checked your oil-level? Or else it may be the oil pump.
Did you get a new one put in when the engine was rebuilt?
Some shitty pics that I got my friend to take for me which he MMS-ed to me resulting in this horrible quality. But it'll have to do for now. Just to give you guys a rough idea of condition etc.
AE86's with their standard engines are quite gutless. But the handling is magnificent.
I would recommend an mx5, chuck some semi-slicks on and some good pads, exhaust and you're ready for some superfun track days
Ive been using a C's for 2 years now and its great and it does shorten the throw a lot. However be prepared to use more energy to get into gears, especially first, which is a bit annoying.
In case you're interested I have a 32 gtr one, with some bent fins, for $150. You can save a bunch over the 33 gtr ones and you can just straighten out the fins with a flathead screwdriver.