greetings again members ! my 99CSVT will turn-over but not start-up !

so far : did a visual ; checked fuse ( no way to check relay i guess ) ; removed rearseat & WAS SURPRISED TO HEAR FUEL PUMP PRIME as i was certain from my research that it was finished . the car had recently been 'bucking'during WOT @ high-rpm's .
" could the pump still work and the REGULATOR or RELAY be bad ? "

so before i commit the car to the shop , any further driveway remidies ?

any of these items possible causes ( COIL , VACUUM , DPFE , IAC , EGR , any other sensor / solenoid / connection )

PATS can be ruled-out & NO CEL was present before or now .

THANKS SO MUCH IN ADVANCE FOR YOUR IDEAS !