how does the voltage gauge look while your driving? does the car die while driving or just wont start? if it dies while driving, or the voltage gauge is low, its probably the alternator. if it just doest start but when u getit started it runs fine. its the battery. sometimes its both.
2007 Dodge Ram 1500
2008 Suzuki GSX-R1000
2003 Suzuki GSX-R750
2003 Mustang Cobra 10th Anniversary - 11.2 @ 130
1997 Thunderbird LX 4.6 - 13.7 @ 103
1993 Thunderbird LX 3.8 - Slow
1990 Thunderbird 3.8 - Slower