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Any idea what may be the most the likely causes.

I had new coils put last month by dealer as they had call back on them.

Also, I am still under warranty. Will this be covered.

Any help will be greatly appreciated.

Thanks

Khurram
 

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Have you looked up the definitions for the codes yet?
IIRC the P0300 is mult cyl misfire, and the P0303 is gonna be a cyl 3 misfire.

my best guess is coil packs, make sure that when they were replaced they used the most updated packs. If you want to, switch the cyl 3 pack w/ 1 and see if the misfire follows...if it does its the pack if not it could be a spark plug giving you issues.

That happend to me on my 98, the coil packs are great, but I had a leaky valve gasket causing my cyl 4 plug to be so cruded up I was having huge misfire problems.
 
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