Just fixed my hard start, low/rough idle, low speed throttle lag and lousy fuel mileage problems on my 92 300TE. I knew there was a vacuim leak, because spraying MAF cleaner at the base of the boot was causing the engine tp rev. I figured it had cracls, but no... Last guy that worked on it didn't get the intake boot seated all the way on the intake manifold! I installed a new boot and know exactly how they screwed it up. The injection body can be easily plopped down and bolted up, and the front side of the boot looks fine. It's on the back side, near the cruise actuator that it doesn't seat. You can't really see if it is fully seated without a mirror and flashlight, and you can't feel all the way around it. I had to make a tool out of 1/8" welding rod to reach down under and behind the airflow flap and push the back side of the boot down. Will try to add a photo of the bent up boot lip when I get home.