My dryer dries to slow. I needs about 3 to 4 cycles for it to dry. I went to an appliance parts store and they told it was the coil gas valve. I replaced them, but it does the same thing. The flame turns on for about 10 sec. and then it turns off. It turns back on within a minute, and it keeps doing the same thing till it finishes. What else can it be?

Thanks, Adam.

I already changed the coils and it still does the same thing. I'am wondering if its the heat sensor?