when i drive normally, my idle is fine. but after i put load on the motor the idle drops to around 500. for a couple of times after its starts and sounds like it chokes then goes to 500. i have it set at 850. i have a chipped ecu, could it be the ecu having bad readings? i have no codes

 

does anybody have any ideas? i've been searching and theres no one with the situation. im going to try some of their ideas anyway. if anyone can thatd be coo.