Question about 1999 Pontiac Grand Am GT

1 Answer

My 1999 pontiac grand am(v6) runs fine till you go to get on the highway or have to go up a hill then the rpms go up the car starts to fluctuate(**** or sputter) really bad were I wonder if I will make it onto the highway or up the hill. It does it when the car is cold and warm. Help!

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.


    An expert that got 20 achievements.


    An expert that got 10 achievements.

  • Pontiac Master
  • 5,332 Answers

My first though is a plugged catalytic converter. This can be checked with a back pressure gauge or by dropping the exhaust where it bolts to the back manifold and then test driving to see if the power is restored.

The second that is a bad MAF sensor. It is located in the air snorkel between the throttle body and the air filter box. You can try unplugging it and see if it drives better.

Lastly it could be as simple as bad ignition wires, plugs, or a coil.

Is the check engine light on? If it is the stored codes would give you some direction to start.

Posted on Oct 12, 2010


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

1999 pontiac grand prix lost power on highway n now it wont start?

run fault codes and check for cam/crank position sensor check that the cam shaft is turning (broken timing belt/chain) Check immobliser operation.

Aug 11, 2014 | 1999 Pontiac Grand Prix GT

1 Answer

I have a 1999 Pontiac grand am v6. When the cars temperature is at 200 and I park it when I go to start it, it doesn't want to start. It takes a while to get it to start. But after I get it to start...

Check your ignition, battery cables, have your starter and alternator tested for defects, also it is recommended to flush and change your coolant as seasons change, during the summer, it's best to run water in the radiator instead of Anti-Freeze, and during the winter, run 50/50. You may also want to have your engine checked for compression problems, replace your thermostat, and radiator hoses, check your water pump, and heads for cracks or warps. I own a 2003 Pontiac Grand Prix SE.

May 22, 2012 | 1999 Pontiac Grand Am GT

1 Answer

When i start my 2000 grand am gt my cars rpms rev up and down till it levels out were the rpms should run at when idling

Have the idle/air control valve checked, the pintal inside could be stuck or just needs cleaning.

Sep 08, 2011 | 2000 Pontiac Grand Am GT

1 Answer

The car starts fine and runs good but is sluggish and cuts out at higher rpms, want to look at the plugs but dont see them

I'm guessing that you have a 2.2L 4 cylinder (The V6 uses a coil pack and wires) that uses a coil over ignition. You'll need to remove the coil assembly to extract the spark plugs from underneath.

Good Luck!


May 27, 2011 | 2003 Pontiac Grand Am

2 Answers

I have a 1999 Pontiac Sunfire. It seems to be high on the RPM's when i go faster in the car. Is there anything i can check to see what the problem is.

rpms do increase when you push the pedal to go faster....but then if it is an automatic tranny, it may be slipping thus rpms are fast but speed doesn't match rpms. luck to you

Mar 26, 2010 | 1999 Pontiac Sunfire

1 Answer

When taking off it will **** and rpms will fluctuat thin die. i can let it sit for a minite and it will run fine


Aug 10, 2009 | 2001 Pontiac Grand Am SE

1 Answer

My 1999 grand am gt 3400 h.o hesitates from idle and stalls if i stop or park on a hill and will do it over and over till i power break it to get out? It starts right back up but is very irritating? Have...

Sounds like a dirty mass air flow sensor but the hill thing is strange...Is the tank full when this happens? Could be a filter and would not hurt to change it (often neglected).

Jul 16, 2009 | 1999 Pontiac Grand Am GT

2 Answers

1997 pontiac grand am gt v6 3.1 problems

you have a short in the steering colum

Jun 28, 2009 | 1997 Pontiac Grand Am

2 Answers

Idle problem

check your relay and underhood fuse pane to see if you pinced some wiring

Jun 25, 2008 | 1991 Pontiac Grand Prix

Not finding what you are looking for?
1999 Pontiac Grand Am GT Logo

204 people viewed this question

Ask a Question

Usually answered in minutes!

Top Pontiac Experts


Level 3 Expert

78267 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8836 Answers

Are you a Pontiac Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides