Hey I have a 93 with a 6cy; anybody know if antifreeze leaks are common or not? Seems to be coming from front of block maybe and drips off front of oil pan. Also when in the cab and you floor it the sound of liquid circulating comes through the heater vents. I bought it 6 months ago. Noticed the sound soon there after, but leak is recent. Around the time I noticed the leak it had started running real rough with little power. Any help would be much apprec.