P0300 in need of help badly.

[PTGsDaytona500GTP]

Had a misfire on cylinder 4 originally. So i did all the wires spark plugs and the 3 coil packs. Now im getting a p0300 code which is random multiple misfire. I am really low on options here i tried my best to do it without any guidance but i dont know what to do anyone who has some advice woukd be great. And no i didnt mix up the wires. Im going to grab some carb cleaner and see if its a vacuum leak.
Thanks for your time.

[BillBoost37]

If you only had a #4 before and now you have a multiple, you either have wires in the wrong locations or something else is off.

What brand of wires did you use?
Where they new?

[FordMan77]

Also, what type of plug did you install? Hopefully the stock irridiums or a copper plug. No platinums.

And double check your wire order using this link. I know you say you didn't mix them up, but it happens more than you would think.

http://i33.photobucket.com/albums/d6.../plugwires.jpg

[PTGsDaytona500GTP]

spark plugs not sure (got them from autozone) i know they are pre-gapped and iridium tipped. wires i believe i got bosch wire set. Coilpacks i got bwd. ill double check to make sure they are not mixed up though. my car is stock btw.