The other day I was getting on the expressway and as I hit the gas to accelerate on 2001 Mercedes-Benz C320

The other day I was getting on the expressway and as I hit the gas to accelerate the engine hesitated and only accelerated at a very slow rate...if I gave it too much gas it began to shake. The check engine light came on and has been on ever since. The engine has the same issue while idling at traffic lights..I put the car in park at stop lights in fear that the shaking will lead to a stall out. It seemed a couple of times the engine "caught" really quick and would accelerate at a normal speed but then returned to the shaking/hesitating. I took it to AutoZone for the free diagnostic hookup and they said my vehicle needed a tune up. I replaced the spark plugs and the problem still exists. Also if it helps, the vehicle doesn't shake while in neutral and I give it some gas. Only while in gear? Any information or suggestions would be greatly appreciated. Thank you.

Asked by for the 2001 Mercedes-Benz C320
you have multiple eng misfires which could be caused by a number of things. first mistake you listened to auto zone. seek a proper diag and est
is this going to be a expensive repair thank you
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1 more answer , 1 more comment
When I give too much gas a my car it began to shake, so I stopped the car and started again. For a couple minutes the car is find but after began to shake, this happened many times, regardless of the water conditions.
It sounds like the coil packs are on the way out. I would suggest changing them as a set as they will all be close to failure at this point. Mine is currently in for the coil packs but I am wondering if it could also be the mass airflow sensor problem. Another issue is the Crankshaft position sensor though the car actually stalls and cannot be restarted.
Hope these provide some assistance.