Those plugs you have in the picture may be for options your car doesnt have. Mine had those unpluged and didnt have the surging issue like yours does. The ISCV is a better bet for the problem, they arent a no fail part none of the parts on this car are no fail just replace it they arent too expensive. As for the FSSSS when you shut it off check your vacuum lines sounds like one is in the wrong place.
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1987 supra NA 5 speed
1JZGTE swap
Tokico Illumina 2 and Eibach springs
Tokico pillow blocks
Suspension Techniques front and rear sway bar
HKS super dragger cat-back exhaust plus test pipe
Greddy Profec B spec 2 boost controller
HKS type 1 turbo timer
Supra sport solid steel drive shaft
Walboro 255 fuel pump
JZA70 Front end mod
18" Volk Racing AV3 18x8.5 front 18x9.5 rear
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