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I just changed my plugs and wires on Tuesday after my car had 300 code. The car has been running awesome for the last 2 days, but this morning when I started the car is sounded to be idling a little rough. When I started driving it seemed to be running fine but the CEL started flashing, and came on again. I reset the computer by pulling the fuses I needed to so I am confused. Does this often happen? Also, when I sart the car with the AC on and the car warm, I get a burnt smell coming from the vents. Any ideas?

Whatever you do, do NOT drive or run the car in this condition anymore!!! A flashing CEL means a serious problem, misfire, which is confirmed by your code 300 "random misfire detected." That burnt smell could be a lot of important crap destroying itself. Check all plugs for tightness, and all wires for a secure connection on both ends. I dont know how much dammage you might have already done, but if you didnt tear up too much important crap (ie. piston rings, etc..) re-seating the wires and plugs should fix the problem. -Nick

As I'm sure you've check by now (FAQ) Code 300 is a random Missfire. Also a flashing CEL is telling you your car is missfiring.

I would check all connections. Especially around the coil pack.

Check that black resistor that attaches to the coil pack to see if it's loose.

Hate to say it, but pull the plugs and look at them. Check the gaps.

What type of plugs did you put in?
What engine?

It is a 2.5 and I installed motorcraft double platinums gapped to .56. I also used fms wires. The CEL is not flashing anymore it is solid, and the car is running great. Before I changed the plugs I had a solid cel with a 300 code and the car ran like crap. All the plugs are in fine and wires are correctly connected, I checked 3 times. I'm going to go to Autozone to get the code pulled again. Also I live in AZ, and it has been 110 the last couple days, so they may account for a little extra heat. I'll repost when I get the code.