Hi Guru's Ive got an arse of a prob with a 1jz non vvti, from a jza 70 manual supra Its fitted in a r32 and I got it running quite a while ago but these probs occurred and I got fed up!!! Basically the engine will run if I hold the revs at around 1500 rpm any lower and it dies, will not idle at all. Secondly if I rev it up to where the turbos start to spool it back fires massively and kicks out a load of black smoke. I tried coil packs and connectors, igniters, map sensors of a working car to no avail. Changed the cps and double checked timing. New fuel pump, new plugs, still no change I've recently 'found the love' again and convinced it must be the ecu sent it off for repair. chucked it back on today and still absolutely no change......... Aggghhhhhhh Does anyone have any other suggestions before I use it for a paper weight??!