finally done but have some problems.

ok I'm back 3 and half weeks later the head gaskets are back in and in effect...........but i broke my timing light and when i set to tdc and 0 degrees, the car seems to act as if I have clogged injectors. slight pressure on the gas and it backfires and stutters, its ok wide open though.. ANYBODY HELP???????:mad:this is how i feel