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p0300 is Multiple misfire on all cylinders , this could be a spark, running lean due to low fuel pressure or air leak or mechanical issue.
First of all check for any air leaks on motor. P0301 is missfire on Cylinder 1 hence the 1 on the end of 301 , 302 is cylinder 2 and so on. Cheers
Is the rattling sound coming from the exhaust? I'm wondering if perhaps you have a loose catalytic converter. P0300 (multiple cylinder misfires) and P0306 (cylinder #6 misfire detected) are probably the cause as to why the car is sluggish, shakes, runs rough and lacks power. Make sure to take a close look at your ignition system (spark plugs, ignition wires, coils...). A spray bottle filled with soapy water can help you find voltage leaks on the wires and coils. Just spray the wires and coils and look for arcing. Replace any component that arcs. Other causes can be fuel injectors, vacuum leaks...).
p0300 should be multiple missfire. check for compression these engines tend to bend valves very easily if ran on old gas or a batch of bad gas. causing it to missfire in more than one cylinder. they also crack heads between valves if overheated.
well the light is blinking because of the misfire it is setting a P0300 engine missfire detected, a plugged fuel injector will cause that misfire or a incorrectly gapped spark plug, also a bad egr valve will cause a rough idle and acceleration problems.but for a correct fix with out throwing parts at it will have to be done by a pro