Has your car been tuned? Do you experience this when you get on it at higher RPMs or closer to 3000? you may be running a bit lean and as you get on the gas you get some knock. Your ecu will pull timing (temporary loss of power) until the fuel suply can catch up. you might consider a fuel pump upgrade.

 

yea i read that wrong i thought it said a rise in rpm i take it back not time for a clutch