where are the shift solenoids located on 1992 toy corolla. automatic tranny

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sometimes my tranny won't shift from 2nd to third until it gets up to 3000-4000 rpms. many times i have to ride 2nd gear at 50 mph for about 3 - 5 minutes till it changes gears finally. then it shifts fine usually till i park it. sometimes it will shift too quickly from 1st to third at under 15 - 20 mph . it sometimes refuses to start out in first gear . i will shift into 1st gear and run through the gears manually . the throttle cable to the tranny was off recently . can it be adjusted and remedy this problem? where on the tranny are the solenoids located and which one should I replace to fix this if at all . 92 toy corolla 1.6 L 4 cyl.