missing on number 2 3 5

it tries to run when your cranking on it then when you let the switch go to run its tries to run on but dies. i had absolutle no probs before the intake swap im starting to think its in the intake but after swapping it it would run but miss badly then it wouldnt run at all so i change the coil plugs and ballist resister and it just sputters and dies it getting fire to the plugs even tried the old carb with adapter and no change. im thinking bout putting the old intake and carb back on