[JLMounce]

It pops out of the exhaust during steady throttle or on deceleration?

Popping out of the exhaust during steady state throttle or during rpm acceleration would be really weird. Popping out of the exhaust is commonly caused by excess unburned fuel exiting the combustion chamber and reigniting in the exhaust pipes.

Does the AFR show rich when this is happening? If not, I would take a good look at where the oxygen sensor is installed and for any exhaust leaks upstream, or within 18 inches downstream of the oxygen sensor.

You didn't state whether or not you were running timing control. If you are, popping and missing may indicate that you have spark that is jumping terminals. This would be caused by the rotor and cap being out of phase. Consequently, this may also be part of a hard start issue.

[stich]

Originally Posted by JLMounce

It pops out of the exhaust during steady throttle or on deceleration?

Popping out of the exhaust during steady state throttle or during rpm acceleration would be really weird. Popping out of the exhaust is commonly caused by excess unburned fuel exiting the combustion chamber and reigniting in the exhaust pipes.

Does the AFR show rich when this is happening? If not, I would take a good look at where the oxygen sensor is installed and for any exhaust leaks upstream, or within 18 inches downstream of the oxygen sensor.

You didn't state whether or not you were running timing control. If you are, popping and missing may indicate that you have spark that is jumping terminals. This would be caused by the rotor and cap being out of phase. Consequently, this may also be part of a hard start issue.

Pops on accerleration only No timing control, no exhaust leaks that I hear.

[JLMounce]

Originally Posted by stich

Pops on accerleration only No timing control, no exhaust leaks that I hear.

If the system isn't giving you any error codes, I'd start looking at your ignition. There may not actually be anything going on with the Sniper, it might be ignition related.

You should also check for vacuum leaks at the throttle body base and the intake manifold.

[stich]

Thanks, it's a good starting point