so its rather warm today i decided to pull my iroc halfway out of my garage and let it warm up in park. i have power pulleys on it so the rpms do get kinda low in gear but she never bucked up and down in drive while rolling foward as she did today , shes been in storage since november last year i changed the iac and tps any ideas what this could be my rpms go down but this is cause i have the pulleys

 

does it do it only at idle in gear(drive & reverse) or when coming to stop? if so check you torque converter

 

only in idle in gear

 

just a question if it is my torque converter which i doubt, but on the camaro how hard is it to change the torque converter

 

power pullies: possible when put into gear, rpms went down a little bit, and so did the alternator output?

 

pro this rpms going down would be a reason for my car to buck like it does