My car has been taken care of on fluids and routine maintenance fairly well, but in the past couple of months it has began to idle horribly low on occasion and stall at random times. I've taken it to 2 different mechanics and they say they can't tell me anything that's an apparent issue. The IAC seems to be a possibility from things i've read, but it has stalled before going 70 mph on the interstate and i get no response from the pedal. It will just slowly downshift and then stall in first as the rpm drops low enough. Any ideas on what could cause this issue? I need it corrected quickly!