I watched your video on finding electrical shirt with test light and neg side of battery then pulling fuses until the light goes out. Does this apply to relays as well?  I have a 2004 Pontiac Grand Prix GTP Supercharged.  No codes, not check engine light.  Dies once engine is warm wether backing out of parking space or driving 70mph.  Won't restart for several minutes and until it decides to start, until that point it cranks for several seconds after key is in off position. Pretty much I've replaced all the easy sensors to reach, as well as the O2 sensors all thats left is the cam and crank position sensor. Because I have NO codes and I know the car was not well maintained by prior owner and I've already repaired several open circuits I am assuming this may be another wiring issue near the engine fuse box, however their is no relay or fuse labeled crankshaft position sensor! Grrrr!  Any wisdom you can share will be greatly appreciated! This girl is losing it!
Thank you,
Pattie