Need a picture buddy.
Yellowing in general usually means it needs food. What other symptoms?
Yellowing means loss of N(nitrogen) and you'd have to be way off in pH for N to be affected being it can be used in soil between 5.5-9 pH. So most likely if you have pH issues causing N def you are way low in pH.
But I'm sure it's something else.
Picture tells a thousand words.