Hello 1988 740 wagon no start

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Mar 20, 2014
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Hello everyone!
My wagon wont start. 260k miles. I had a no start every once in a while but would always restart after a few tries. Also, every once in a while it would buck and try to die, tach would bounce and then it would pick back up and run normal. I have checked or replaced the powerstage,coil,distributor,hall effect. I have also sprayed the intake to make sure it was not fuel related. It seems I am missing the trigger from the ICU. My question is how do I find the ICU and check. I found the Bosch box 554 I think it is the ECM. I thought that the ICU was near but can not find. I would appreciate any help or suggestions to solve this problem. Thank you.
 

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