Misfire in cylinder #1 and 2

[rafalptak]

I put a gasoline to my 1997 Camry (230 thousand miles). Probably I did not seal a fuel cap appropriately (like a half turn) and went straight to the car wash. My engine was on idle. When I got out the check engine light started blinking or remain on constantly AND my engine was losing a power.
So far I know that has misfire on cylinder #1 & 2, and codes P0300, P0301, P0302 are returned. When car is parked and RPM are higher than about 1200 then all cylinders are working but as soon as I lower RPM or try to drive everything goes bad again.
In meantime I realize that a clear air hose was broken, so I replaced but it did not help.

I am going to replace spark plugs today, but I have a feeling that this is something else and I think that the key is in cylinder #1&2.

Does any one have any idea?

[TrailDust]

Moved to the appropriate forum.....

[Nervous]

Replace high voltage wires (to spark plugs) too, if they are old you may have problems in wet conditions.
If your fuel contains water now, put a bottle of 96% alcohol in your gas tank, this will remove water.

[najmul_alam]

i have the same problem with my 1999 V6 LE and my mechanic told me its the problem with the injector...need to get them cleaned...