Take off your manifold/header. Double gasket it and use RTV high temp copper. Torque properly, then retorque a couple times after heat/cool cycles. Try again.
s*** yea!!! I found it! Well Mark aka 65swb45 told me to check the anti backfire valve that goes into the air rail. The diaphram was not moving a bit, I unpluged it from the air rail pluged it and bingo no more backfire. Now where can I get a new one? Does Toyota still make stuff like this?