1998 Grand Marquis Misfire

Hi all first post. I was driving my 98 mgm at highway speeds and had what i believe was a misfire. The car started to gallup and the check engine light blinked a few times. i let off the gas and the car returned to normal operating condition. i drove it home without another misfire. car has 106k miles. it was sitting for about 1 year before i bought it. Maintenence already performed: upper and lower ball joints, oil change, power steering fluuid change, air filter, fuel filter, transmission pan drop/ cleaned and refilled, transmission filter, oil pressure switch.

the guy i bought it from said he changed the plugs within the year.

any ideas what i should do next?

Thanks,
Keith

Late answer, but for anyone who gets this. A flashing check engine light means a misfire bad enough to damage the catalytic converter, so it's worth chasing even after it goes away. Read the codes first. A misfire code ends in the cylinder number (P0301 is cylinder 1, and so on), which tells you where to look.

If it points at one cylinder, swap that cylinder's plug wire or coil with a neighbor and see if the misfire follows it. If it's random across cylinders at highway speed, look at fuel: a car that sat a year can have a weak pump, a dirty filter, or varnished injectors. Since you already did the filter, test fuel pressure under load.

Dana