2004 pontiac grand prix GTP electrical gremlin?

[SLOGTP04]

[FONT=&quot]2004 pontiac grand prix GTPMods[/FONT][FONT=&quot]: Walbro 255[/FONT][FONT=&quot], HPtuners tune[/FONT][FONT=&quot], cold air intake[/FONT][FONT=&quot], straight piped[/FONT][FONT=&quot], [/FONT][FONT=&quot]3[/FONT][FONT=&quot].4in pulley[/FONT][FONT=&quot][/FONT][FONT=&quot]Now to get into the issue[/FONT][FONT=&quot]. so Friday the car died ideling in some heavy traffic and wouldn[/FONT][FONT=&quot]'t restart just crank[/FONT][FONT=&quot], so I being the young strong boy I am pushed it into a parking lot and let it sit for about 10 min while waiting for a ride[/FONT][FONT=&quot], tried to start it before I left and it ran for about 30 seconds then died and just cranked after[/FONT][FONT=&quot].[/FONT][FONT=&quot]. My dad came about 45 min later had it running for 20 minutes in the parking lot[/FONT][FONT=&quot], and brought it over to me at work [/FONT][FONT=&quot](caddy corner to the parking lot[/FONT][FONT=&quot]) and I got in it to take him back to his car and it died in my works parking lot and wouldn[/FONT][FONT=&quot]'t start again[/FONT][FONT=&quot], again cranking and not starting[/FONT][FONT=&quot]. Got it running about 20 min later[/FONT][FONT=&quot], got it to my bay at work and it died yet again[/FONT][FONT=&quot]. We swapped out the ICM[/FONT][FONT=&quot], still did the same thing[/FONT][FONT=&quot]. Yesterday we swapped the crank position sensor because I[/FONT][FONT=&quot]'ve heard that could[/FONT][FONT=&quot]'ve been my issue[/FONT][FONT=&quot], still didn[/FONT][FONT=&quot]'t resolve it[/FONT][FONT=&quot]. Key on engine off I get 50psi to the rail[/FONT][FONT=&quot], running it gets 67 up until it shuts off [/FONT][FONT=&quot](because it shut off it doesn[/FONT][FONT=&quot]'t go under 67 at all[/FONT][FONT=&quot])[/FONT][FONT=&quot]. I even made sure i heard the pump running up until it died[/FONT][FONT=&quot], and it does[/FONT][FONT=&quot]. We also checked spark when it wouldn[/FONT][FONT=&quot]'t run just crank[/FONT][FONT=&quot], and it HAS SPARK but won[/FONT][FONT=&quot]'t run[/FONT][FONT=&quot]. Nothing on scan tool data looks crazy[/FONT][FONT=&quot], cam [/FONT][FONT=&quot]& crank sensors look very close [/FONT][FONT=&quot](within 5[/FONT][FONT=&quot]-15 rpm which I assume is normal[/FONT][FONT=&quot])[/FONT][FONT=&quot], MAF[/FONT][FONT=&quot], MAP[/FONT][FONT=&quot], etc readings all look exactly the same as any other time[/FONT][FONT=&quot], day[/FONT][FONT=&quot], etc[/FONT][FONT=&quot]. Someone please give me a lead[/FONT][FONT=&quot]![/FONT][FONT=&quot]We[/FONT][FONT=&quot]'ve also cleaned throttle body if that matters at all[/FONT][FONT=&quot].[/FONT]