ISC should stand for Idle Speed Control. Theres a good chance it IS a vaccuum leak, mainly because you said it runs okay at W.ide O.pen T.hrottle, which in most cars has its own preset fuel mixture. if it IS running rich, you probably DONT have a vaccuum leak, because that would cause a LEAN condition (too much air as compared with fuel). check the connnections at your air meter, which i've seen people refer to as an AFM on supras (all the other cars i've owned and worked on called them MAF's and MAP's...). If that sensor is bad(or has a bad connection), theres a good chance that its going into 'limp' mode and is dumping a generic amount of fuel because it's not getting an air reading. let me know what you find...good luck
|