Q: Misfiring
while changing a spark plug i took out one coil and disconnected it, also another at the same time. i was told that will cause all cylinders to misfire unhooking more than one at the same time. and when i hook it up to a reader its telling me all cylinders are misfiring.. my car shakes at 30mph but normally when my coil goes bad my check engine light blinks.. its on but not blinking,tcs light aswell.. while changing spark plug my coils seem good not corodded.. could it be my spark plug wiring? if all my cylinders are misfiring i couldnt drive something has to be wrong
My car has 250000 miles.
My car has an automatic transmission.
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