rough idle and bouncing rpm gauge

**Flip97GTP** · 05-15-2013

Hello All,

I have a 97 Grand Prix GTP with 228,000 miles, it idles rough and misfires also. I did a scan on her and these codes come up p0300 and p0441.

When she is in park or at a light and idleing the rpm gauge bounces up, the car jerks foward and the head lights flicker. I just purchased the car about a month ago and haven't had a chance to get a tune up yet. Any help would be appreciated.

Thanks

**ericspecullaas** · 05-15-2013

welcome p0300 and p0441 have been solved may times over on here so LOOK IT UP. and GL

**Flip97GTP** · 05-15-2013

Originally Posted by ericspecullaas

welcome p0300 and p0441 have been solved may times over on here so LOOK IT UP. and GL

Ok thanks! I have looked up them codes and got some info on them.

I want to know if some other members here have had this problem and if they did what was the fix. Just looking for some options.

Thanks
Again

Flip

**Fivefingerdeathpunch** · 05-15-2013

Start with new plugs and wires.

If it still does it, then look into coils or the ICM, depending on which cylinder(s) is misfiring.

**ericspecullaas** · 05-15-2013

FFDP im guessing you made waffles

**BillBoost37** · 05-16-2013

Flip.. to give you a little info on getting help. I got lazy one day and stopped looking up codes. These days I suggest the poster put the code number and the name of the code if they'd like some help.

I know RMM, but which evap is 441? Help us help you.. cause these days I'm lazier or busier than I used to be and many other member have found that the "help us help you" works well.

**Flip97GTP** · 05-16-2013

Originally Posted by BillBoost37

Flip.. to give you a little info on getting help. I got lazy one day and stopped looking up codes. These days I suggest the poster put the code number and the name of the code if they'd like some help.

I know RMM, but which evap is 441? Help us help you.. cause these days I'm lazier or busier than I used to be and many other member have found that
the "help us help you" works well.

Ok I will keep that in mind! Thanks for the advice.

**Flip97GTP** · 05-16-2013

Originally Posted by Fivefingerdeathpunch

Start with new plugs and wires.

If it still does it, then look into coils or the ICM, depending on which cylinder(s) is misfiring.

I will do a tune up this weekend and I will try to keep this thread updated! :-)
Thanks for the advice friends.
Flip

**BillBoost37** · 05-16-2013

while doing the tune up, give the throttle body a good cleaning, maf as well. These cars are notoriously simple to fix things like this.

**Flip97GTP** · 06-12-2013

Could this be the alternator?

I check the alternator with a volt meter. When car is off the battery reads 12.8 volts and when its running I get14v for the first 5 minutes and it goes down to 12.8 to 13. It also does a lot of fluctuating on the volts, up and down. Also when i disconnected the positive cable on the battery it stalled. Is that normal on these cars?

Note: While this is doing that the headlights and dash lights also get dim.

**Flip97GTP** · 06-14-2013

Well, fellas and gals! It wasn't the alternator that was bad because I put a remanufactured one in there from Pep Boys and its still the same. I am going to return it and put my old one back in.

I am thinking its the MAF sensor now. I am going to the junk yard this weekend and try to find one there.

I will update!
Flip

**Ryan99639** · 06-22-2013

I had this exact problem for like 4 months after I bought the car, I did new plugs, new wires, iac valve, coil packs, u name it Nothing solved it. Until I got a professional diagnosis from a local shop that found my intake gasket was leaking into a vacuum somewhere. So maby u have something along that line. Just trying to save u the time and money plus headache trying to find it, That's what mine was throwing the same p0300 codes too. Good luck