When A/C is on the engine struggles and jumps/jerks/surges

Hello,

Engine is in drive and idle, but repeatedly struggles and jumps/jerks/surges (not sure what to call it) with A/C on, stops and resumes normal idle when A/C gets turned off, and even with A/C on but in neutral or park it does not do the surging. Throttle body was cleaned at local Toyota shop, but now engine is struggling and on occasion during driving (at around 45 and especially up hills) with or without A/C on. Torque converter was replaced 4 years ago so I'm not thinking transmission. More like Idle control valve, though the local shop cleaned my whole throttle body 2 weeks ago. No previous accident beforehand, and car has never been in an accident. Not sure what it is! Just hoping it won't break the bank to fix!