i have a idle prob when i come to a stop light my idle drops and my oil drops to

i have a 91 hatch i put a d16z6 i did all the rewire to make it 4 injectors i used a 88-91 si ecu a 89 si dizzy
i went throught all my wireing and soderd then so they had the right connection but for the longest time now it idles weird when i come to a stop light i don't think its any thing elictrical because there's no codes i put a new iacv on not to long ago to i have the vavle seals on the head redone to the only thing i have'nt done is the piston rings its really starting to irratate me