[s-cars] Any idea

[Elijahallen92 at aol.com]

Hi, today under full boost between 3000 to 4500 rpm my car started 
backfiring. Not a loud backfire more like the sound you here with the stromung when you 
let of on the gas at low rpm and you get those low pitch burps. It does it 2 
or 3 times and then stops all the way to redline. There is a hesitation when it 
does it but nothing like the violent overboost cutout. I don't know where to 
start with this one. I guess I'll change the plugs to rule out something 
simple. This only happens at full boost. Any thoughts? Thanks,

Elijah