i seem to have a slight prob when i got to time my 93 ,with the car running it surges first off and no i have good vacum and i also know the iac is working right. when i pull the base timing module out the car idles fine but when i plug it back in the cars timing seems to be all over the place along with the idle actin dumb.the only thing i can think of is the eec is gone..anyone have a insight on this prob