Car stumbles under boost

[8bud]

Car is running great, but when I lay into it once I start to get a good amount of boost going it will stumble and pop. Any idea what to look for?

 

[84wh1]

Mine use to do that, so I changed my O2 sensor and it ran fine.

 

[8bud]

Just had to put a turbo in- it blew lots of oil thru the exhaust. That's probably it. Getting an intermittent ses light too. Thanks.