It could very well be the egr valve, unplug it(driver side) & see if that makes a difference & I'd also open the t/b throat & spray some carb/throttle body cleaner down the throat as well as the inside edges where the blade operates. I'd swap out the fuel filter & make sure you get the clips w/ it.....Jack up the rear of the car of course use jack stands & you'll see the filter, you'll need to get the special filter clip wrench & use the oil drain pan.
Introduce Mr. Torsen to the mix
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Bigger brakes then you- D23 crew- D-Tech- Sedan Revolution= #131