Recently replaced old spark plugs (NGK from what I can remember) with Denso Iridium plugs on a 99 A4 1.8t that is chipped with a K04 upgrade. Directly after I finished, when standing hard on the gas it seems like the motor is choking when the turbo really starts to kick in, which never happened before. But when you ease into the gas, this problem does not exist. After pulling them out to take a look at them, they are burning perfect. Gas mileage has remained the same, idle hasn't changed, and double checked to make sure they were in fact the right plug for the car. Nothing has changed beside feeling jerky when really laying into the throttle.


Has anyone experienced this, or something similar problem with Denso plugs (I am just glad I got these things for half off, cause I am not sold on them at all as it stands)? Or, is there a set of plugs that anyone would recommend in place of these with the upgrades made to the motor? Any suggestions or ideas for some other systems that I might want to check on would be much appreciated.

Thank you.

 

I use Bosch Platinum 4+.

regap for smaller gap. and the problem will go away. do like 0.20inch or something from 0.40inch.