2000 Altima Weird kickback Exhaust

[linkfeeney]

What's up?
I have a 00 Altima. I had my fuel injector cleaned couple of weeks ago. For some reasons, I get this weird kick back when i turn on my car. I dont get it all the time, just sometimes. It sounds like when I turn on the car, the exhaust hitting the bottom on my car or the muffler is? When I was watching him cleaing the injector...i saw the whole exhaust shook on my bottom on my car... I assume is normal with all the white and black smoke from the dirty injector... I can't seems to pin point the issue. Some info help please? thanks!

[JustSayGo]

Injector cleaning uses alcohol to clean and doesn't make any smoke or engine shaking. Spraying water into the intake makes white steam and black smoke from carbon that is removed by the steam, and makes an engine run very rough. ATF, diesel fuel, or antifreeze, all make white smoke. If it sounds like the exhaust is hitting the body that is probably what it is. With all the engine and exhaust shaking maybe an exhaust hanger or motor mount broke.

[linkfeeney]

thanks... I put super and it seems to fun fine today... man its annoying me if it keeps doing this!