91 GT Strange idle issue after throttle pressed???
FIRST OF ALL: I was having issues with egr system, the line that connects to the egr valve was having constant vacuum. I cleaned it out and it started working properly. The next day, it started doing the same thing. The vacuum came back on the line that connects to egr, it stopped after i cleaned it the first time but now its sucking air again....What causes this?
SECONDLY: And my idle is pretty steady at about 7rpm if i start the car with that egr line unplugged, but as soon as i hit the throttle once, the idle gets all screwed up and starts jumping around 6-7 rpm. If i turn the car off and immediately start it back up, the idle will be fine again; but as soon as i start driving or tap the throttle...bam the idle becomes eratic again. What should i look for or check. I cleaned out most sensors and checked all vacuum lines,, what else could it be?