Have a '72 TR6 that was recently rebuilt and running fine and decided to install a Moss SC. After installation the motor won't rev when the throttle is pumped a couple times and it seems to almost flood. Let off and it will idle. When first started and before warm up it will pop off, and if you try to hold the rpm's at around 1500-2000 it creeps back down and almost stalls, let off and it will idle. Seems to run decent in the higher rpm range when driving. Had Jeff at Advanced Distributors rebuild and recurve the distributor and it's set at 12 deg btdc, and the idle mixture screws are backed out 1/14 turns. tried adjusting both ways and got nowhere. Any help would be greatly appreciated. Thanks.