Usually that fuse powers the alternator and the fuse box. It would have to be a big short to ground to blow that fuse.Its possible the main wire to the alternator is touching a metal spot, or the alternator is shorting out inside when it is running.What is draining the battery may be something else, or the battery could be discharging after the fuse blows if the alternator is not charging it.
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Definite signs of intermittent vacuum leak downstream of the maf. Check for leaks from the air cleaner to the throttle and all hoses on the intake manifold. Also check for leaky intake manifold gaskets.
Do It Yourself Diagnosis and Repair
If the transmission is not actually slipping, the most likely culprit is the "governor" in the transmission. Fairly easy repair for a transmission shop.
Either your heater core is plugged or the blend door under the dash is not moving from cold to hot. Do you hear any noise from under the dash when you move the dial from coldest to hottest? If not then likely the blend door is stuck in the cold position.