Symptoms sound *similar* to problems I've had with an AE93RV and AE112R.
I think this might be something endemic specifially to the 7AFE as I've not encountered it in any 4AFE.
Carbon buildup.
I once picke up an AE93 that was idling terribly, lacked power and chuffed blue smoke. What I did:
Have a look down the guts of the throttle body and check that the butterfly is seating properly. As well as the carbon, the butterfly tends to corrode around the edge and it doesn't form a perfect seal. There's also two valves on the intake system, idle bypass and cold idle, that can sometimes get sticky and perform erratically. I took all mine apart and cleaned it up with carby cleaner and a toothbrush, soaking the valves in petrol for a while beforehand. Throttle butterfly might need a quick rub with emery paper if its corroded.
I also sprayed a metric f*ckton denatured alcohol into the intake and let it sit for a while, before starting the car and raping the hell out of the engine whilst spraying more carby cleaner down the intake. And by raped the engine, I mean revved the snot out of it for about 10 minutes. Several times.
Worked a treat :)
Of course you may have a different issue altogether, but I've seen it on quite a few 7AFE's now.