Why does left side of engine have weak spark?
Intake coil maybe weak, but if the exhaust side is strong it should run if it is getting fuel, injector pulse and has compression.
Engine was running fine when it turned off so I assume compression should b good enuf to turn on. Engine cranks and kinda sounds like it's gonna turn on. I replaced the coil for weak side and nothing changed.I unplugged the fuel line and it has high pressure
get some starter fluid and spray some in the intake hose and see if it fires off briefly, if it does then you have a fuel problem, possibly something wrong in the injection circuit. If it doesn't then as you seem to have spark then the only thing it can be is the spark is out of time, possible crank sensor. HTH
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