I see. The IAC grommet seemed okay, it was still very pliable but maybe I should have replaced it.


I also bit the bullet and replaced the MAF (VDO/Continental), coils (Bosch), and O2 sensors (Denso). It seems somewhat better but it's not completely eliminated (it's also possible it's a placebo effect).


If I had a vacuum leak, wouldn't that show up in the long term fuel trims?


Is it plausible that a slow or lazy IAC would cause tip-in problems?


Does the electronic throttle body get slow or lazy with age?