[scooby doo]

Guys;

I'm having a ruining issue with a MY94-WRX (import). and was wondering if any of you may have any incline to what it could possible be, some how I'm managing to be patient with it but i feel it wont be long till i torch the dam thing!
il start of from the begging sorry if this drags a little.

The car had some small mods and was going well. had it dynoed and all was well.
But after a few weeks the car began to feel flat from around 3,800-4,800rpm.
only so slightly and the idle was abit hit and miss and was starting from cold was a pig and had an ever such small miss fire here and there on idle . The EML flashed up saying there was an error with the ICV and Coolant temp sensor. i also had a small weep of oil around the crank case breather, so i thought ill strip the whole top end off replace the coolant temp sensor, source another ICV and clean the bay in general and put it back together,

Well this took a period of 6 months as not having much time to get on with the car.
The car is put back together and ruining but with the same sort of issues just not as bad. and no EML light up.
With the engine stone cold, flick the key to prime the pump,one primed turn to crank over and it starts as it should then dies within a second or two. crank it again and it starts and idles at around 1,600-1,700rpm. all is fine no miss fire, but after around 3-5mins the car becomes warm the idle is sitting nicely at 1,000rpm. it suddenly starts missing and running lumpy and coughing about. and i cant under stand why its doing this.. i must say last nite it was idiling fine running sweet after setting up the tps thought all was great, went to start the car at lunch today and same problem..

The car has been put back to a pretty much stock car.
just has a 3in de catted system, Hks panel filter, Walbro 255ltr, carbon canister ditched, along with the a/c and using a Dawes device.

Here's the bits I've changed/replaced to try and cure the problem.

Airflow meter- swapped.
oil + filter changed.
Coolant replaced.
plugs standard platinum grade 6 not gapped just fitted from the box.
ICV-swapped.
another loom from a 94 wrx as thought mabe a wire has broken down.
TPS-swapped and set to the correct voltage set up.
ECU-swapped from another 94wrx,
Fresh 20 liters of v-power,
new Subaru coolant temp sensor,
coils- swapped to 4 non cracked versions (awaiting on a set of Newgae to arrive in the post to fit)
NEW genuine gaskets on Tb, Turbo-downpipe, uppipe-turbo, Headers-uppipe, header gaskets, inlet manifold gaskets, ICV gasket, rocker cover gaskets,

Does anyone have any other surgestions?

thanks benji