Should I replace my molding wall before applying tiles?
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Are you talking about a wall affected by mold? If so, you must either cure the wall of the mold and any mold behind that wall or replace it. Covering it up with tile, will not stop the mold or the smell from it. If it is black mold, it is even hazardous to your health, so you would need to wear a mask to remove it. I hope this answers your question, but if I have misinterpreted it, please do let me know.
If the mold is only on the surface use Hydrogen Peroxide to kill and clean, wear gloves long sleeves an eye protection. Let cleaned wall dry at least 72 hours. Then seal with a good mold killing primer (a must).
If you can't get it completely clean try a bleach solution, allow plenty of ventilation. If that still doesn't do it cut out the drywall and replace with a moisture resistant drywall, then use the mold killing primer to seal.
If you’re asking if to replace base molding the answer is to take it off like the tiles and then put the New one
Put the tiles on first, then finish with the molding last.
molding is the last step
If it is peeling, chances are the drywall has gotten wet behind the peeling, you MUST cut out the damaged drywall section and replace with new drywall. There is no alternative. Wear a mask, eye protection and industrial gloves to cut out. Use a level to draw straight pencil lines to the center of the next unaffected wall stud, if the stud(s) have surface mold, you must scrub them clean, then let dry for at least 72 hours, then also seal with a mold killing primer. Home Depot, Lowes sell a very good product.
Replace the drywall with a moisture proof drywall (usually blue surfaced). Can also find at big home store.
If you hire someone to fix, make sure they don't bull you into doing less, the mold and peeling will just return again in a short time. There are no short cuts to mold abatement.
That is probably the best idea. At least having the professional identify what it is. Then you can decide whether to have them fix it or diy. Good luck.