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Author Topic: 03 GT misfire and code p0307 Javier ¯ Member # 547 posted                              I started to get a misfire about a week ago so I went ahead and changed plugs oil and regular maintinance work on it. Now the car runs worse, I get a misfire when the engine has a load on it. While its idleling its fine but when i drive it misfires and now i have a P0307 code telling me a misfire on #7. Side note I have a build up of a yellow/off white substance on the driver side head and when i took off the coil on plug it was milky yellow/off white crap in the upper spark plug... Posts: 1147 | From: Bay Area | Registered: Nov 2001  |  : Blind 2.3L CAFords OG Member # 3052 posted                              move the COP to another cylinder, clear the code, and see if it follows, if so that COP is bad. -------------------- 89 LX Notchback ex 4cyl, 14psi 02 Harley F150, 15psi Posts: 8521 | From: Fairfield | Registered: Jul 2003  |  :

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