Okay so i posted a thread last month about my 1980 grand prix lj with the 265 4.3 it wouldnt start and i replaced the ignition coil plugs coil rotor button and cap only thing i havent replaced is the plug wires. I got the no start issue fixed. Fires right up now..Needless to say Ive replaced the carburator and i cut the exhaust short and put a big cherry bomb on it. Ive got a little exhaust leak on it.. But what im getting at is.. Everytime i give it gas and it drops idle it pops out of the exhaust.. I dont think anything is wrong with the valvetrain since i dont drive it im working on it and when i got the car it never use to do this.. Its everytime i go to give it gas it loads up and pops out of the exhaust,shooting flames and all. I have no idea what it could be.. Ive advance the timing and it still does it.. My plugs are gapped at 45° and it says that it should be gapped at 60° idk if maybe that is a cause.. I was also thinking the air fuel mixture on the new carb is messed up. Could the cam idle screw need adjusted.. Do i have a weak fuel pump? Im stumped and i dont know what else it could be.. Any suggestions? Thank you!