I just purchased an 05 crossfire limited. Car has 76K miles.

I'm noticing that the car hesitates for a slight second when shifting into gears (2nd-3rd -4th etc). In addition, the car is starting to vibrate when idling. I assume the car needs new wires and spark plugs but I'm not certain thats the reason for the slight hesitation between the gears. The check engine light isn't on & from what I know, the transmission leak was previously fixed by the dealer (years ago). I don't know if the transmission is low on fluid. How do you check it?. . . . and if so what fluid do I use and how do I refill it.

I live in Orange County, California. I would appreciate the help and guidance for which I am new to german cars and I'm only 20 years young.

Thank you in advance,

John M.