INTERMITTENT MISS (SCATTERED, NOT JUST 1 CYLINDER)
1986 Mercury Station Wagon
July, 20, 2012 AT 7:57 PM
Have 2 canadian-built ford wagons ('86 and '89). Both have 302pfi engines. Both exhibit an intermittent miss at light load (particularly after the trans shifts) which is much more pronounced when warm. Have replaced just about everything in the ignition system, tried disconnecting the egr valve, cleaned the iac motor, all to no effect. Strange thing is, the problem will disappear for a day, a week, or a month and suddenly return with nothing having been done to the car. Absolutely stumped. Any thoughts? Thanks in advance.