I had the crank no-start issue for about 9 months after also buying an 02 P5 that wasn't running. After spending a ridiculous amount of time diagnosing and replacing parts in the crap-shoot that it was...it ended up being the main relay for the fuel system was bad. (Green one) it was only like...
i am also getting the same chatter. seems to be less evident the quicker i release the clutch, most evident when starting from a stop in 1st, or near stop in 2nd, and also significant when downshifting to 2nd for engine braking. asked many mechanics and most thought it was likely a warped...
similar issue resolved
my first guess would be a worn out ignition switch. you can get one for about $40 on rockauto.com and install it (very carefully), and send it back if it doesn't fix the problem. I had a similar issue, but different in that it was a crank/no-start, rather than a...