I blew my fuel pressure sensor the other day which caused a nasty misfire when the car was at idle. Guys on the ford forums said once the sensor was replaced, reset the pcm, change the oil and it should be fixed.. Well it's still missing after the car warms up, I can be at a light and it will dip down to about 400rpm, then back up to 1000, etc, etc. No engine light, but the car is definately missing. Just wanted to see if any codes have been thrown.