Thread: another GTP stalling out sometimes

My wifes 2000 Grandprix GTP was stalling out about a month ago.She was driving down the road and she told me it was like someone just turned the key off.IT wouldnt start back up.So i jumped in the pickup to go and tow it back.It was about 30 minutes till i found her thats another story.Anyways i reached in turned the key and it fired up and i drove it home.I started reading that night and CPS jumped out at me from all the reports of stalling.So i went to the Dealer and got one and put it in.The car has been running great.Then she called me this morning at 6am telling me the car stalled when she was coming to a stop sign and then in town at the traffic lights.She says it wont idle.I have done a tune up with fuel filter in the last 1000 miles.2 years ago they had to put the new fuel pump resistor in it and relocated it on the firewall.IT does have a K&N filter in it and when i did the tune-up i did clean and re oil it.Maybe i got to much oil on it and the MAF sensor is dirty.I have never cleaned the MAF or IAC and it has 118,000 miles.Im going to try and clean the 2 but if you have any other ideas that would be great.I did a search and was reading about all the others ones stalling.By the way great site.

Thanks for fast response.I talked to her today on her lunch break and she told me it would do it in park or nuetral when she would start it the motor just wouldnt idle it would stall out.Going down the road she said it was fine.So i think i can eliminate the Torque converter not unlocking since it would only do it when you would drop it into gear.Plus she just called and if she keeps her foot on the gas it will stay running in gear and out of gear.So as soon as she gets her i will pull the maf and iac.Thanks for all the help!

The IAC had alot of Carbon build up.I cleaned it with a tooth brush and rag.The MAF sensor had some gunk built up on it.I took a Q tip and some cleaner safe for MAF sensors.Now you can see the actual metal pieces of the sensor and they shine.So it was dirty.It does idle alittle higher now.Before it was down around 500 to 600 or so now in park its up around 800-900.

Well im lost on this one.I cleaned the IAC and MAF and the car ran great for about a week or so.Then the wife was driving it home from work cruise set at 58 and she felt it kinda lunge forward and then the throttle wasnt responsive.By the time she got off the side of the road it was stumbling.After it stopped running she shut the key off for a couple minutes and it fired right back up and drove the other 25 minutes home with no problems.I checked the codes and nothing.I checked live Data and had a friend who is a gm tech on the phone and was reading all the data to him.He still thinks it may be the MAF he told me it can be intermitent and can make it stall out.I have already replaced the cps cleaned the IAC and MAF any other ideas?

I will wait and see if someone will respond on here and confirm that i can unplug it and run it to see if it doesnt stall out.

I know its an old topic..but did you ever find out what was causing the stalling? My 97 has a VERY simular problem and my MAF has already been changed

I cleaned the MAF agian and it has not stalled in a few weeks.I think i may have over oiled the K&N filter when i replaced the CPS and did the tune up and thats why it was stalling out after i did all the work.But i took some mouth wash and a q tip and cleaned it agian.

i would think if its a vaccum lines it would idle really rough all the time.Mine was running fine all the time then just lost power and then it would stall out.I recleaned the MAF a couple of weeks ago with mouth wash and all is well.A buddy of mine who is a GM tech said forget the MAF cleaner at the parts store just use some scope mouth wash and it made it nice and shinny.So we will see.I have my fingers crossed this was it.