Mechanics

F150 MISFIRE OR VACUUM LEAK?

2001 Ford F-150

Smells problem
2001 Ford F150 V8 Four Wheel Drive Automatic 260, 00 miles

Truck began to misfire, sputter while driving, idle really rough, loss hp. So I go to auto zone, they hook up the little tester, " misfire #7". I replaced the coil, problem solved. 2 weeks later, the same symtoms happen again. Loss hp, shaking, idle rough, sputtering when I drive. So I go back to auto zone today to hook up the tester again. He said it read.&Quot; lean on 6, 7, & 8. He told me I have a vacuum leak, not a bad coil. What do you suggest
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Eddie kelly
July 15, 2010.



Could be one of the following below: 1. Vacuum leaks
2. EGR and PCV valve.
3. Low fuel pressure.
4. Dirty fuel injectors.
5. Mass Air Flow Sensor.
6. Oxygen Sensor.

Rasmataz
Jul 15, 2010.