I have a 1997 pontiac sunfire and the check engine light keeps coming on, i have had the computer erased several times cause i thought i solved the problem of my misfire. it only misfires when i get to lower RPMs and i aint pushing the gas petal down. it doesnt misfire when its under a load though. i have disasembled the throtle body and clean all the carbon out of it and put fuel injecter cleaner in my gas tank. any suggestions?