kipkippo

INFO: 87 chevy K5 5.7l Tbi
Today I tested the est wire voltage drop tested the wire to the computer in the on position not running and tried wile running but after it started there was a loud boom that my ears are still ringing from and found the muffler had exploded. it runs really really good with the wire unplugged. but will not run hardly at all with the wire plugged in. the dash is out to locate grounding points and to trace wires, nothing looks bad. no grounding issues I ran a jumper from the connection of the est bypass to the computer and it runs good but when I undo the jumper. It stalls and acts like it is
180 degrees off. Can any one help I have alldata available. i have uploaded the wiring diagrams that i have for it with the connector links because i can not find them online anywhere. please sticky this thread for wiring diagrams.
TPS VD test closed was .5v 3/4 open 4.5v full open 4.3v
mapsensor within spec.
Any help would be quickly put to the test and results poste quickly.