SR5

it idles funny(drops rpm, and goes back up), and when i give it gas it chokes and wont go anywhere. this has happened a few times...NOT CONSTANT or any pattern. the engine is perfectt and tuned up, so im thinking its electrical or tranny. the reason i think it may be tranny is the other day the O/D flashed and i couldnt drive up my driveway, and its not steep or nothing, i could drive on flat road but it wouldnt go up the driveway. and ofcoarse next day it was fine.

so what do you huys think its an 94 auto with 180xxx