My 96 Chevy Tahoe has been running kind of "weak" for awhile now. Yesterday morning it barely turned over and today the battery is dead. I pulled rotated the dast forward a few months ago to fix the defrost. Ever since then it's been week. It seems to be really boggy when I push the gas pedal down but will shift no problem. It also has this sort of raspy whine when I let off of the gas after going around 60. I have no engine light. I'm thinking something is shorted out but no fuses are blown either. Thanks in advance--