Hoping someone might have some insight. I know what the code means. I already changed and properly torqued spark plugs. Quick rundown, I began the timing belt and everything that goes with it(water pump, pulleys, oil pump shaft belt & pulley, etc.) about a year or so ago, and due to my health and work was no able to complete the job until just recently. I had removed the #1 plug just to find tdc. Upon completing the job, during the test drive, chk eng light came on after 10 mins of test drive. Came up p0300, changed all the plugs as I had forgotten to do so during the timing belt install. So, after properly gapping and torqueing the plugs, went on yet another test drive and everything was fine. No chk eng light, so I drove it pretty hard just to be sure, and still nothing. The car had very little fuel, light had come on during test drive, and mind you this fuel had been sitting I would say for at least 1.5yrs or so. Stopped at 76, topped off the tank. Drove it home, all was good. Next day, my brother was driving me to a dr. appointment, which is like 5 mins from the house, very easy driving, and out of nowhere, chk eng light pops up. After dr. we go home, and again p0300. So I am aware that I should probably change the wires as well, By the way, this is an '06 evo ix se, 73,xxx miles on it, and bone stock, always has been. It is weird that it came on during such a short and easy drive. I know maybe the old fuel might be giving the injectors/fuel filter an issue, or at least I am assuming. Loooking for some advice, as the car was prior to the timing belt service. I realize that the car sat for a long ass time, but just seems odd that this would happen as it was fine prior. I am thinking that it has to do with the old fuel, but we had put a full tank of brand new gas in it, unless something go stirred up from the tank due to the long inactivity. Anyhow, any thoughts and or advice would be really appreciated. Otherwise I suppose I will just bring it up the street to KT Motoring in Chatsworth. Just, I tend to want to be able to problem solve on my own, especially something like this. Thanks for taking the time to read and if theres anything I left out that could possibly help to better diagnose the issue, plz post so I can properly update. Thanks again.