i have a 1983 mustang
5.0.... i traded for the car a few weeks ago, the kid who had it blew the head. he bought a reconditioned head from autozone and tried to replace it without removing the manifold. so i pulled the motor out and replaced every gasket on the motor including the oil pump becuase it was siezed. i got the motor back in, put it on tdc dropped the distributor in and it fired right up. now when you rev the motor it backfires thru the intake manifold, and if i dont hold it over 2000rpms when engaging in 1st gear it stalls and wont fire until the next day. today when it did the same thing but after it stalled it would fire over a littlebut stop turning as soon as it fires. im out of ideas if anyone has any tips or advice of how or where i could find the problem i would greatly appreciate it, thanks, tim.