I replaced the spark plugs and coil boots and one coil pack on my 1999 Grand Am. My car runs much better but when I turn the air conditioning on it runs really rough. What do I need to do next?

Asked by May 30, 2014 at 06:38 PM about the 1999 Pontiac Grand Am 4 Dr SE Sedan

Question type: Maintenance & Repair

4 Answers

114,955

Runs rough only at idle but runs good at highway speeds? If so possibly dirty/faulty idle air control valve or dirty throttle plate.

3 of 3 people found this helpful.
17,025

a/c adds load so what about plug wires (that you neglected to change.} Spark breaking down.Air flow like dandyoun said,throttle body,sucking air somewhere,etc.

3 of 3 people found this helpful.
17,025

How about just a plain old fashioned dirty filter?

3 of 3 people found this helpful.
10

my car is doing the same thing its a 2001 Pontiac Grand Am se 4 door coupe with a 2.4 liter 4 cylinder. I had this problem once before and it turned out to be the plastic cover that protected my coil packs had cracks in it. it was causing my coil packs to spark and short out against the ground chassis once the plastic cover was replaced problem was taken care of and fixed until 2 years later, now starting with the same problem only milder. I don't know what to do I'm ready to take it to a shop. I'm frustrated!

Your Answer

Grand Am

Looking for a Used Grand Am in your area?

CarGurus has 1,269 nationwide Grand Am listings starting at $994.

ZIP:

Pontiac Grand Am Experts

  • #1
    tenspeed
    Reputation
    7,820
  • #2
    John Saffrahn
    Reputation
    1,610
  • #3
    Tom Demyan
    Reputation
    1,540
View All

Related Models For Sale

Used Pontiac Grand Prix
24 Great Deals out of 2,726 listings starting at $1,500
Used Pontiac Firebird
12 Great Deals out of 887 listings starting at $2,500
Used Chevrolet Impala
549 Great Deals out of 35,119 listings starting at $1,250
Used Ford Mustang
606 Great Deals out of 36,206 listings starting at $1,800
Used Chevrolet Camaro
412 Great Deals out of 30,520 listings starting at $2,495
Used Chevrolet Malibu
970 Great Deals out of 66,500 listings starting at $1,000
Used Honda Civic
780 Great Deals out of 69,924 listings starting at $1,350
Used Pontiac Bonneville
554 listings starting at $2,995
Used Nissan Altima
976 Great Deals out of 77,100 listings starting at $1,627

Used Cars For Sale

2005 Pontiac Grand Am For Sale
119 listings starting at $994
2004 Pontiac Grand Am For Sale
275 listings starting at $2,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.