Does the car seem to slow down with the check engine light on? (Stillen Supercharger)

geohartanto

I've been having check engine light about 3-4 months after my SC installation and does the car seem to slow down or is this just a placebo effect?

I recently changed the spark plugs in my car and it had no check engine light for about 3 days, after that the check engine light came on again.

Also, do any of you have any suggestions on why the check engine light keeps turning on and what to do to make this engine light go off?

Thanks as usual everyone.