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you have changed all the electronics but that is half the problem
misfires are from low fuel pressure , faulty injectors/tips , wiring to the injectors and ECM
Yes, the ECM is the last thing to replace after all other possibilities. No spark could be bad ignition coil, bad Ignition Control Module (controls the coil circuits for spark), bad plug wires, the crank and cam sensors (for ECM to determine spark timing).
Check the ICM -it can be tested at a parts store. If good, check the crank sensor.
ECM requires both crank sensor signal and cam sensor signal to fire the coils. Check for spark at the plugs first. Check the plug wires, then the coils. Only if you have no spark at any coil would I suspect the ignition module, and even then only if you have a good crank and cam signal. Do you have any codes stored in the ECM? They could help pinpoint the problem.
Check to see if the cam position sensor or the crank position sensor is misaligned or has a corroded connector plug. The ECM needs to get a firing pulse from all cylinders. If the engine is a dual cam and is not attempting to start, some engines have a timing device (chain) for each bank. If the chain broke on one bank, the cam sensor can not possibly fire because the cam is not turning.
Check the ignition switch please. Had that on a 93 Ford that it was bad and the coil wasnt getting any electricity while the switch was in "start" position.
Check ecm for number 1228253. If it has this one in it you will have a cutting off problem. Gm replaced these with #16198264 The cam sensor magnet on the cam gear will deteriorate and give problems. This will require removal of the timing cover.
You said you changed the ecm module, is that the ecm or the ignition module. Do you have access to a scanner to check cranking rpm? That way you can test the new crank sensor and the wiring and the ignition module.
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