F250 sputtering
she sputters around 40-50 MPH..... Changed mass air flow- cleaned carb- checked for vacuum leaks-- Idles fine. Would this be a bad coil? it's a V10. It is not throwing any check engine light. Wou...
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Bad plugs or COP can definitely cause a problem without throwing a code. My Expedition was almost undrivable it was missing so bad, but it did not throw a code. A blu tooth OBDII dongle and the Torque app on my tablet allowed me to see that 3 cylinders were missing badly, just not enough times in a given time frame to turn on the light. In my case, new plugs solved the problem. You can check the strength of the coils with a HEI (High Energy Ignition) tester. It has a huge air gap inside that stresses the coil, so if you see a spark the coil is good.
