trans or engine problem

I have n 89 grand marquis and i got it from my grandma.She said that it got recalled for the trans and it go replaced. At around 40 mph the car starts to jerk a little and goes away when i slow down. It also has a VERY rough idle im thinking that there is a miss or the injectors are bad if somone could help me out with this that would be great

In a dark, a spary bottle with water and spray the spark plug wires then start the engine and see if there is any lighting comming out of them anywhere.


I have n 89 grand marquis and i got it from my grandma.She said that it got recalled for the trans and it go replaced. At around 40 mph the car starts to jerk a little and goes away when i slow down. It also has a VERY rough idle im thinking that there is a miss or the injectors are bad if somone could help me out with this that would be great

New plugs and plug wires was the solution to my very similar problem last year.