Right when u start it it goes POP then u hit the gas pedal it pops and lags.

Checked timing 20 times and have tried messing with the dizzy firing order is correct.

Any suggestions? maybe no o2 would cause this?

 

Which block/head/cam/camgear are you using?

 

pics of head / dizzy .. you sure you having the firing order right ?

 

figured it out, needed antifreeze had a huge leak and the IAC valve wasnt getting no anti freeze