fried 2 logic modules in a row - please help- 87 csx

[87shelbyz]

i just swapped in a 89 common block into my 87 csx,no big deal.i used all the original electrics,the only thing i changed was the oxygen sensor.i also repaired a broken wire to the power module.i fired it up ran for a little while and died.tried to resart and it just cranked and no start,not even a fuel pump whine,i took out the lm and it was cooked,i had rechecked all my grounds and connections put in another lm and a different power module, just in case that caused it and it cooked the second lm to.now i am pissed,dont know where to start,sometimes now when i turn on the key i can hear a relay inside the power module going nuts,the tach needle jiggles around and the check engine light flickers.i really dont want to fry another lm.

[87shelbyz]

well after 2 day of f*ckin around with this car, come to find out the new bosch o2 sensor i put in is the culprit.a little advice to all,dont ever under any circumsatnces use a bosch oxygen no matter what.i am going to write them a letter and see if i can get some $$ back for the 2 lm's i cooked.

[sergio]

How did the O2 sensor cause that?

[87shelbyz]

it has double the resistance of a mopar unit,shorted to ground.