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What is year--make--model? If your obd2 then hopefully the code will tell you which cylinder, then you check spark--fuel--compression on that cylinder. If the code is p0300, the problem should be something common to all cylinders.
is the check engine light blinking? if so have it tested for codes, Kragen auto and others do this test for free, just ask for a OBD2 fault code test. let me know the results and we can work from there.
There is a power supply to the ecu that is missing either permanantly or interrmitently, it may be as simple as a fuse, or it may have a bad connection in a loom plug or a broken wire...
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