1996 Chevy Blazer Engine stall after 5 sec.

One year ago our fuel pump went out I repalced it got it running good soon afterwards my wife was going to work and the blazer stoped working she said the moter just lost power and stalls out and a big puff of blue smoke out of the tail pip. I replaced the central sequential fuel injection body also called the spider with a new complet unit. I got the spider at auto zone for 300 the only diffrence form the old one is the injectors are at the end of the poppets instead of in the meter body itself. I instaled it I got the moter to start but it stalls out shotly afterwards like it is running out of gas. I have a fuel presure gage on the fuel intake it read 62 when key is on then when moter starts it drops to 53 and runs ok about 5 secounds the the presure goes up to 62 the moter stalls out like it is runing out of gas but ther is gas present. I can turn the key off then right back to start the moter starts right back up runs about 5 secounds psi goes up to 60 stall out. It does this the exate way every time even if I try this 10 times in a row.