I got a miller furnace and I replaced the pressure switch on it because it was giving me a code for switch stuck closed
I replaced the switch and it still does it
If I press on the circuit board it will come on but then sometimes it will turn on but sometimes it won't
Can it be that my circuit board is going bad?

The circuit board could have some cold solder joints or a bad or loose connection or bad ground.

i got a miller furnace and i replaced the pressure switch on it because it was giving me a code for switch stuck closed
i replaced the switch and it still does it
if i press on the circuit board it will come on but then sometimes it will turn on but sometimes it wont
can it be that my circuit board is going bad?

Did it specify that it was the pressure switch

Yeah some times it will say pressure switch stuck open and then sometimes it would say pressure switch stuck closed

Make sure your t stat is working properly it could be going bad sometimes calling for heat and sometimes not I've learned most the time it something simple hope this helps

Well I t doesn't lose signal from the stat
I checked he W in the board