Search in here, Seville, and Northstar Performance for threads concerning stalling, coast-down stall, DTC P0300, P0385/6, P0335/6.
New CKP's (CranKshaft Position sensor) are: one gray, one black, made in Japan, not Mexico (siemens). Try Luke in Parts at Lindsay Cadillac, M-F, 9-5 EDT -----------> over there, or
www.rockauto.com.
You might need a few of the plastic retainers which hold the lower splash shield - they tend to break - pull the center button out 1/4" and wiggle the retainer out. The CKP's are retained with 10mm bolts and can be a pain to remove: there isn't much room.