Originally posted by wadejg
When warm, at idle, the tach will fluctuated every 5-10 seconds between 500-1000 RPM. And every once in a while it will actually stumble and go down to about 250RPM and almost stall out, with a bit of a shudder. The idle is erratic enough it will actually jangle the keys in my ignition at a stop.
doesnt seem sound to me. our FXT, when at idle at a stoplight, will ever-so-slightly develop a harmonic vibration that can be felt, but it is very faint. the rpms do not fluctuate. the car does not heave or die. it just slightly vibrates enough that if you paid close attention you would notice it. i attribute it to motor mounts or bushings with slack somewhere.
nothing like what youre experiencing. start keeping a detailed log of whats happening to the car, and definetly get that serviced at the dealer
what does an ECU reset do?