2002 Ford Taurus W/intermitant misfire codes

[austin4913]

I keep getting a P0302 and a P0316 on my 2002 Ford Taurus. It is showing cylinder 2 misfiring in the first 1000 rpm's. This did not happen until the thermostat stuck and it overheated. I fixed the thermostat and after that I kept getting the misfire code for cylinder 2. I changed the plugs and wires. The plug in cylinder 2 was completely destroyed. the ceramic electrode was just gone. After I changed the plug it ran fine for a couple of days and then the damn light again. checked the plug and it was in perfect shape. Don't think it's a head gasket because it does not leak any water, no water in the oil or coming out th etail pipe. If I reset the computer the car will run perfecct (good as new) for about 2 days and then the light comes on and blinks (Makes it run like crap, I think the computer is shutting off fuel to an injector as some kind of safety) After a minute or so the light is on but not blinking and it still runs bad. I found a technical service bulletin that addressed those very codes and it suggested to have the computer reprogrammed with new threshholds. I guess the emission limits were too narrow or something. that may not be the problem though. it just seems very supsicious that i did not have this problem until after it overheated. I am unsure how to proceed now as I can not afford to take it to a ford dealer where things are very expensive. Thanks in advance.

[stv840]

if those are the codes and you have the DOHC then ck the egr valve to see if it is stuck or if the motor for the valve is working