Hi For over a year trying to repair Grand Marquise LS 1992. Spend a lot of money by replacing a lot of parts, but did not helped to solve problems. I'm happy that that mechanics not a surgery doctor. When I start ignition, motor works fine. After a 1 - 3-5 min starts to become noisy and shakes. One or two cylinders probably not working right. If not to give more gas, motor shuts down and I have to start ignition again. Same times I almost can not hear how motor runs.(It runs but very quiet, what I like. Help! if any body can. Thanks Sam If I have your Telephone I would call. (You don't have to pay for long distance).
Mechanic cleaned SOMETHING (by words forgot what but it was not simple).
Yes, almost forgot, tried different computer.
About payment, $18.00 it's nothing to compare what I spend on:Mechanics unneeded repairs, some of them in a double.
Then was their guesses. I think,.. more sure... ans so on.

Country: United States
Make: Mercury
Model: Grand Marquise LS
Year: 1992
Engine: 8-

Already Tried:
New spark plugs wires New Spark plugs mass flow Air sensor New spark plug module New spark plug controller New (forget name but can find a Bill)