2000 GM, 97K miles, sudden multiple problems.
 

Stopped to pick up wife and car wouldn't start again. Cranks okay but wouldn't start. Towed home and found: tries to fire if some fuel is poured into air intake, door locks inop manually but okay with remote, no clock display, interior & trunk lights inop but exterior lights & turn signals okay, no fuel pressure at rail test point but fuel pump relay is energizing, security LED dim but not flashing. Bought the wiring manual to troubleshoot. All relays & circuit breakers removed and tested (good) with a 12v supply & meter. All fuses check good. Fuse link at Battery Junction Box good. Checked G200, G201, and G400 grounds - all good. There has to be some electrically common cause for this but I sure have yet to find it. I'm suspecting either the LCM (replaced 4 years ago) or the PCM but still need to do more tests when the temps warm up. Anyone have this or a similar situation before?