If it's Motronic car don't touch it. make sure the air plate is adjusted to specs before messing with the mixture screw. use an ammeter to measure the DPR current, adjust the plate to bentley specs and check current again
If you want to drill it out.. yup do it. The plug has two parts, soft aluminum top, hard steel bottom.
My Motronic Bentley says to drill the soft aluminum top part of the plug with a 2.5mm (3/32 in) bit and then use a sheet metal screw to extract the hard steel bottom plug. Adjust the idel mixture screw with a 3mm hex wrench. Don't know anything about Jettronic.. so good luck with that.
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