i have a 99 camry i have mis codes(p0300,p0302,p0303) and i was wondering what you would recommend to change or check for now i am going to check for vac leaks i am going to check egr valve see if it is clogged and change the fuel filter

so far i just cleaned the idle air control the idle don't bounce like it was before now and i got the random mis fire code mis fire cylinder 2 and 3 mil pending on misfire 4

 

I checked the sparks plugs and found that spark splug 3 the spark was tracking and they have white deposits

 

save the codes , clear all code ,mark coils with numbers,front coils are 2,4,6 back are wires 1,3,5.swap coils run engine and check to see the new code , if code number change means bad coil ,very normal problem on camry's.