car shoots under heavy load

when i drive my car under full load there was 2 time a shot like a gun.the car is fine and everything is o.k. but is this the ignition that makes the fuel in my exaust explode?i ve never heard before my car shooting and i ve nothing changed.
i have a b16a turbo with msd ignition.

thanks swissturbo

Is it just backpressure?
Or maybe your running too lean.
Have you noticed this any other time other than when you have a full load on your car?

don t you mean too rich?i ve never had that before.its happend only two times under full boost driving.
both shots were at 7000 rpm.but the car is o.k and still goes like always

Originally posted by swissturbo
don t you mean too rich?i ve never had that before.its happend only two times under full boost driving.
both shots were at 7000 rpm.but the car is o.k and still goes like always
my bad, too rich.
I don't know what I was thinking.
I used to have this problem on my old lude, and I was running SUPER rich. But I wasn't even boosting.

Check for an exhaust leak in the turbo manifold and exhaust system.

It's a common cause of backfires.
:cool: