2003 Mustang GT 4.6 2V 5 Spd 100K
I just got finished fixing this problem. Let me start from the begining. In August i started noticing that I was getting a slight stutter once in a blue moon, upon acceleration very slight in all of this I never had a problem with idling. Months go by and this happened here and there finally in November it was very noticible, but I never got a check engine light so I thought it was bad gas and let it go until it was tank after tank, finally I got the check engine light about 3 weeks ago, flashing which told me it was a misfire. Now this lead me to Autozone to code it for me and gave misfire cylinder 6 and 8. So it was a sparkplug change and should be done. Plugs out of cylynder 4 was shredded, 6 a little oily and 8 was fine as were the rest. After the change car ran perfect for about 2 weeks the began to stutter again, strange thing was if the car was cold it would run fine for about 10 minutes until it got warm then start to stutter on acceleration. This was driving me crazy and I started looking through all forums to find out some info. Same as last time no check engine light. FInally I read in some post pull the neg battery terminal off for atleast 30 minutes to let the computer reset then go out and drive it u ntil the check engine light comes on, so I did and it took me about 55 miles before it came on, back to Autozone and got a code for misfire cylinder 6. Now I had figured that it can't be fuel because wouldn't that be all the time even at start up?