So I'm looking at this from several ways. I can be driving fine and when I approach the VTEC kick in, I get puffs of smoke out the back. Only in higher RPM's. and I've noticed that I go through coolant a lot lately. 1. Could be a Cam Seal leak 2. Could be a leaky head gasket about to go 3. Could be running to rich, which I know it is already. 4. It's def getting worse. What do you guys think?