Do you still have the stock intake manifold? There are a few 1/4" coolant lines that run around the intake manifold. I had a leak in the same place you described, where one of those small hoses was on, but not clamped. It leaked half of my coolant in about 10 minutes. I wouldn't have even seen it if it wasn't spewing coolant.

If you're sure the timing is correct, then you're probably running really rich. Troubleshoot the TPS and MAF as well as intake leaks. Also, I rode in a B13/GTiR that wouldn't go over 5000rpm... BOV was leaking boost, making it super rich.

Chris