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

105,735

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 out of 3 people think this is helpful.
15,925

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 out of 3 people think this is helpful.
15,925

How about just a plain old fashioned dirty filter?

3 out of 3 people think this is 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

Add photo

Related Questions

Grand Am

Looking for a Used Grand Am in your area?

CarGurus has 1,665 nationwide Grand Am listings starting at $1,995.

ZIP:

Search Pontiac Grand Am Questions

Pontiac Grand Am Experts

#1 tenspeed
tenspeed
Reputation 7,430
#2 John Saffrahn
John Saffrahn
Reputation 1,550
#3 Tom Demyan
Tom Demyan
Reputation 1,360
View All

Related Models For Sale

Used Pontiac Grand Prix
27 Great Deals out of 3,749 listings starting at $879
Used Pontiac Firebird
13 Great Deals out of 797 listings starting at $2,991
Used Chevrolet Impala
796 Great Deals out of 34,708 listings starting at $799
Used Ford Mustang
399 Great Deals out of 44,403 listings starting at $1,000
Used Chevrolet Camaro
310 Great Deals out of 38,867 listings starting at $1,250
Used Chevrolet Malibu
1,076 Great Deals out of 85,119 listings starting at $1,995
Used Nissan Altima
1,094 Great Deals out of 83,208 listings starting at $670
Used Toyota Camry
1,076 Great Deals out of 98,044 listings starting at $1,250
Used Honda Accord
886 Great Deals out of 82,090 listings starting at $999
Used Pontiac Bonneville
6 Great Deals out of 674 listings starting at $1,599

Used Cars For Sale

2004 Pontiac Grand Am For Sale
439 listings starting at $2,995