help!!! P0300,P0301,P0302,P0303,P0304

[smilecow]

My 99 2.2l camry got some code last week ; P0300,P0301,P0302,P0303,P0304

I though that they were the spark plug problem so I replace 4 of them with new geunine ones and spark plug wire too.

After installing them, I turned off the code, drove one day without code
and then the next day they came back. the same codes: P0300,P0301,P0302,P0303,P0304

I repeated installing but they usually came back in 1 day.. but I don't have any problem for driving. except the light on , it is like a normal car.

plz give me some advice

[ShawnTRD]

Did you get some really bad gas? I'm seeing a lot about misfire