With my 89 conv i had a horrable surgeing idel after i did some mods to the motor!i put a e-303 cam 1.7 rockers,trick flow intake dynomax headers and some more stuff it was 5 years ago so i dont remember:P but i had a horrabile problem!! I thought about it and put a 2600 stall converter in my AOD and that fixed it! and after a few years i got sick of blowin out AOD`s.I put a crap t5 in it and at low speeds i do get a surging problem! but now i just let out my clutch!