Rough running like it has dead plugs

Asked by Doiturselfer Dec 29, 2019 at 04:58 PM about the 1995 Ford F-150

Question type: Maintenance & Repair

95 f 150 with a 302 5liter. Was running ok when i
parked a week ago. Started it up to move it and it
didnt want to run , very rough . So i have replaced
the plugs wires are still good. Again  it runs but like
uts missing or only running on 4 cylinders. Any

3 Answers


Battery has a full charge and connections all good? As far as spark, in the past, I have used a digital multimeter, low voltage setting, engine idling, touch the spark plug wires, one at a time. You don't penetrate the plug wire insulation, it's an inductive reading, you just touch it. I've seen readings of .6--.7 volts, so low reading. If you get readings bouncing off zero, there's your problem, Whether it's spark plug wire or something else. We been talking about spark, but, could be other issues? How long since overall tune-up? Any applicable trouble codes? Engine needs fuel--spark--compression, proper amounts at proper time.


How about the cap, rotor and spark plugs?


If any of the contacts on these or the coil are not clean metal then they should be replaced , sounds like an ignition problem for sure . You did the plug wires one at a time right ?

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