get a vid of the engine. to check codes all you do is go to the diag box(the lil gray one next the the fuse box under hood) and jump te1 and e1 with a paper clip. you could have a vac leak, might need to clean out the isc, tps. check your codes
650 is the spec for idleing rpm. if it drops below that the engine will run ruff cause its harder to keep the engine going with such low rpm. whats the engine sound like?
might want to get the engine light fixed. i never checked for spark when mine did it. iirc you could still get spark even if the cps is bad.
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=FI&P=12
try jiggling the cps wires. mine will do that from time to time and i just jiggle them a few times try if no do it again and it will start within 3 times.
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