Originally Posted by Silock
Gas dude is here now. Just a weird interaction between the water heater venting and the furnace being on that overloads the exhaust vent because of the way the vent tees together, which is why it's intermittent. Only happens when the water heater and the furnace are going at the same time.
He told me how to fix it and is just finishing up. No crazy death traps in the house. Sorry to disappoint!
i was just getting ready to post if anyone had heard from you. obviously i skipped page 2.
glad youre still alive.
as stated with these other knuckleheads. never mess with natural gas.