Error codes on Celica I want to buy
Im looking at buying a 2000 gts, the issue is it has error codes p0300 and p0304, I need to daily this car and i'm worried its gonna shit on me after I buy this. It only has 120k miles on it and the spark plugs and ignition coils were all replaced after the codes without being fixed. Intake manifold gasket was replaced, all vacuum hoses were replaced, coolent flush was done, lift bolts replaced. compression test, block test, and leak test all came back healthy. The owner says they stuck a borescope down each cylinder and they all look fine, crosshatching is good and no damage they could see. The codes come and go and only really come when idling so I honestly dont know what it could be. I dont wanna purchase a car that will break on me so does anyone know what could be wrong?