After sitting for a week in my snowed in driveway, my 02 jetta stopped displaying the CEL/Flashing G.P.(Code P1562). I'm still having the "Shudder", however. This got me thinking. Could my oil blowing EGR be sending faulty info to the computer. Or maybe I have a loose/bad ground somewhere. Could this be an electrical gremlin instead of the I.P.? I am willing to have the I.P. rebuilt, but only if it needs it. Does any of this seem legit?