Any advice please. i had my car had it's coil packs and sparks replaced a few weeks back and all seemed fine, but i've noticed it's not running as smooth as it should or as quick and if you look at the engine whilst ticking over you can see a slight kick like it's missing a bit. the garage plugs in the computer and nothing showed up. Now i don't know what to do, it's only slight but it is pissing me off.