[89firebird]

Ok heres the deal I picked up an 85ss monte with a 78 Camaro 350 in it.
car sat for 4 years headers rusted off of it car started up and ran good only ran it for a few minutes to load on the trailer and bring it home I have no history on car other then it sat for 4 years.

I just installed brand new long tube headers on it along with a new starter and new accel plugs because that's what I had on my shelf at the time figured why not use them anyway now that I have the exhaust hooked up and started the car up it is popping out of the pass side exhaust its at idle and through the rpm sweep. only ran the motor for about 2 minutes and shut it down. Has a weind intake and edlejunk carb on it. Car has true duals with no h pipe or x pipe so I know for certain it is out of the pass side. I just changed the valve cover gaskets as well and its stock heads with stock stamped steel rockers some of them felt a little loose. Trying to figure out what could be the cause of the popping problem I have not replaced the cap rotor or plugs yet but they did seem to in ok shape. Any ideas on what to look for would be appreciated. thanks guys