Clean your MAF sensor

[immortality]

If your car has a MAF sensor (and it should unless you have a MAFless tune) check your MAF sensor and clean it if it's required. this is expecially true if you run a aftermarket oil impregnated filter like K&N

to cut a long story short, the missus VS was running poorly etc. this wasn't noticed as the effect was accumulative over a few years resulting in very poor throttle response, increasing fuel usage etc. after cleaning it's like a new car with new found power, better economy and it actually goes when you stab the loud pedal.

Clean your MAF

[xrsist]

should be done at every service imo

[Simonn]

sorry did not see link