Please Help! - on vacation and 126 is dying

[davestx]

My 1991 420SEL with newly installed 560SEL engine won't run for more than 30 seconds. The problem seemed to occur when the traction control and abs activated at the same time in the snow. Could be coincidental. Engine started to idle at 1500. I put the car to bed and this morning I swapped the three relays behind the firewall with used relays from the 560 donor vehicle. I replaced the two right next to each other and one with the 10 amp fuse. No difference. The car was not dying at first. It started to die when I tried to drive it in the snow and again the abs and traction control activated. Now the car will not run for more than 30 seconds. Please Help!