So, my 1967 mustang I line 6 stalls out sometimes when I accelerate. when I come to a stop sign or light, it stalls out at times when I accelerate to the point to where I put it in neutral it doesn’t do it as much if at all. I’m able to idle in park just fine but When I hit the pedal while idling lately it’s been stalling and cutting off. does anybody know what this could be and how I go about trouble shooting the issue?