How do i stop my particle emitters and only making them play on :Emit() insted

[glass osprey]

How do i stop my particle emitters and only making them play on :Emit() insted

local part1 = script.Parent.Part1.ParticleEmitter
local part2 = script.Parent.Part2.ParticleEmitter

while true do
    part1:Emit(1)
    wait(1)
    part2:Emit(2)
    wait(2)
end

and one mor ething how do i make the particles always running and not only when the camera is looking on it

[boreal sinew]

dont use a while true do statement