For no good reason, one of my engines throttle stop working!

No matter what joy stick i use, sidewinder 3d pro, logitech extreme 3d pro, saitak you name it.
but, it only happens when i restsart and i hafta fire the motors ta get em goin cuzz the auto wont flip the fire button when its supposed to 😕

If its anything like fs 2004, its because you are
bumping what i think is the E key, which selects engine 1.

Let me fire up fs and check

Yeah if its the same in FSX as in FS2004, under the control assignments under engine controls the E key does engine select.

I always used to bump it, and it selects only engine 1 for the throttle control, best bet is to re-assign it.

are you saying reassign control + E for the auto start?
(i have a habit of hitting the "A" key when i try to engage the autopilots "Z" key)
(and i did reassign my spoiler key to /) i forget why but it must have been for a similar reason 😂
but, is there someway to reset that without having to restart the flight?(the throttle troubles)

I couldnt find a way to fix it in flight apart from changing the E key. The way engine select worked was you would press E, then press a number 1-4 on which engine you wanted to select from your throttle. Not sure how to reselect them all.