Thread: Rough idle

The car is a 97. The problem: When I start the car it idles kinda rough. I would say the RPMs fluctuate around 600-900. It does not do this all the time. The LTFT stays at +16 when this occurs. STFT fluctuates from +16-20. During driving I have no problems. The STFT and LTFT lock in at 0. When driving and I let off the throttle the LTFT goes straight to +16 as well. I don'y know if this is normal though. I have checked the vacuum lines over. I hear a light sucking noise around the front underside of the SC nose. Checked that line it's free of cracks. Then I spoke with J. Vriezema he said to unplug the MAF to see if it idled normal. Well it did. So I'm not necessarily sure if that the problem though since it does not do it all the time. Also no codes are going off. I checked for exhaust leaks and do not hear any. So this is where y'all come in. Ideas?
New wires(ac delco)
Recent plug change

clean the maf.

no codes yet?

I need some MAF cleaner cause I'm guessing carb cleaner would not work. It did not look dirty when I pulled it out, not that this means it couldn't use a little cleaner. The p0102 came on, but I had unplugged the MAF.

use only maf cleaner. nothing else.

It's doing it again. I hooked a real good vac gauge up. It kept fluctuating from 16-20, but when I unplugged the MAF it stayed perfectly at 20 and idled normal. I just want to be positive it is the MAF before I drop the money on one. Any input bluegtp91 or Billboost?

buy a used maf from a junk yard, they cost about 40 bucks with some kind of warranty.

im running 2 years on a used maf all good still.

My local junk yard has them listed at 16.50, lol... Rock Auto has them new for 60

it dont need to come off a s/c engine. mine came off a park ave with a n/a motor.

all you need to do is match the part # on the top of your maf, to the new/used one at the yard.

our mafs are in a lot of Gm cars.