hey i recently changed out my lifters everything seems to be in order except for when i go to start the car it turns over normally but i get alot of backfire in the carb. is this a timing facter? any help would be great..also i have not adjusted the vavles yet i left them loose to hear the tap to adjust while the car is running..chilton suggest the cap and rotor are faulty but before i did the work everything was fine execpt for extreme vavle tick even after adjustment later to find almost all of my lifters had no spring any ideas could really use the help on this one