its un-usual i got to admit, as the car goes fast, even with the engine management light on the dash, as it was very sluggish before on take off until i had the idle speed and throttle cable tightened by a tuner as a freebie, so reason to why its not gone under a full diagnostics, as worried of the cost it could spring up and is still under finance for just under another two yrs, so dont want to splash out to much cost yet, until i get the finance off, Another strange one i took the bluefin superchip tune 3 off and restored original back on, obviously EML sprung back on after a little while, but the speed hasn't lowered, seems there is no difference in performance, that puzzled me as i thought it would drop a little.. will the denso iriduim spark plugs burn more fuel, as i noticed it has been running through fuel since i put these in and should i put NGK laser platnuim plugs back in, as i only put the denso in for the magnacor ign leads