I have a 2008 nissan titan, runs great, until I try to floor it, basically anything over 2500 ram or flooring it. Truck starts to almost feels like avapor lock or governor and even has backfired, and now has started smoking so during episode bad?? I've tried all new plugs, all new coil packs, mechanic told me the injectors are all proper and compression check was ok?? It the truck does have aftermarket kNm filter as I've heard comments about it. The truck came with the LED brake lights as I have read that they also cause issues, I don't see how that much but then Again I'm not to intelligent when it comes to newer trucks, I have no clue but can not afford to keep buying parts and guess I'm gonna have to sell it and really don't want too.....