1999 suburban 5.7l Vortec. Start and die.

What is your question?

No codes, no security light, fuel pressure around 60psi, good battery. Acts like injectors cut off. Was running fine, just hard start when Warm. Went over a big bump, and when shut truck off to go into store, came out and wouldn't stay running. Tried wiggling harness = no fix. Dies and fuel pump still running for a second. Spray brake clean in throttle body and will run for as long as i pulse the spray correctly. Please..... any help appreciated. At a loss. Spider failure? How do i check for injector signal? I know it's a pain to access the spider so if that's it i would like to make sure before i start disassembly. Thank you in advance.

How long has your 1999 GMC C1500 Suburban had this problem?

2 days