Stared engine in the morning. engine knocked and shook terribly, turned off and restared and done the same thing only less so. Called Infinite didn't know what the problem is. No engine light, does not comes on. Stared the third time and ran fine. Ran fine all day. Somewhat converned about this problem.
engine starting problem on 2004 Infiniti I35
It's so difficult to guess without being able to experience the problem first hand and at least do some basic diagnostic test. Nissan had some bad camshaft/ crankshaft position sensor issues but I just looked there is no technical service bulletin applying to your engine/year. You obviously lost ignition or fuel or something that caused a misfire. There should be a pending code for the cause of the misfire stored in the computer of your car, it will not cure itself but when the code does illuminate the check engine light there will certainly be a code stored identifying the fault.