02 gmc. 4.3l problems returning to idle

Asked by Feb 01, 2017 at 06:26 AM about the 2002 GMC Sierra 1500 Work Truck Standard Cab LB

Question type: Maintenance & Repair

Truck starts and runs great. Idles great. But if u rev
it when u let off gas and It returns to idle it drops
down and wants to stall. Some times it shutters
and picks back up to idle. Sometimes it stalls.
Always cranks right back up and runs
fine.replaced iac.

3 Answers

109,845

Make sure the throttle body is clean, if that doesn't help then it could be the ISC motor is slow in responding and may need replaced. If it is one I think it is it's not cheap.

79,125

Try cleaning the Mass Air Flow Sensor that is in the intake tube running to the throttle body with electrical cleaner.

32,665

Just don't put carb clean on the MAF sensor lol, it will destroy it. They make a MAF cleaner.

Your Answer

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 12,089 nationwide Sierra 1500 listings starting at $1,775.

Postal Code:

GMC Sierra 1500 Experts

  • #1
    dragonflyoffshore
    Reputation
    5,520
  • #2
    John Saffrahn
    Reputation
    3,820
  • #3
    Glenn Clingenpeel
    Reputation
    3,570
View All

Related Models For Sale

Used Chevrolet Silverado 1500
196 Great Deals out of 12,263 listings starting at $2,750
Used Ford F-150
608 Great Deals out of 9,561 listings starting at $2,295
Used GMC Sierra 2500HD
22 Great Deals out of 1,706 listings starting at $3,600
Used Chevrolet Silverado 2500HD
21 Great Deals out of 1,524 listings starting at $4,995
Used Toyota Tundra
43 Great Deals out of 1,487 listings starting at $5,995
Used Toyota Tacoma
36 Great Deals out of 1,355 listings starting at $6,700
Used Dodge Ram 1500
44 Great Deals out of 455 listings starting at $2,495
Used Ford F-250 Super Duty
25 Great Deals out of 722 listings starting at $3,500
Used Chevrolet Tahoe
8 Great Deals out of 984 listings starting at $7,600
Used GMC Yukon
8 Great Deals out of 1,115 listings starting at $6,950
Used Chevrolet Camaro
956 listings starting at $11,965
Used Ford Mustang
3 Great Deals out of 999 listings starting at $3,900

Used Cars For Sale

2018 GMC Sierra 1500 For Sale
7 Great Deals out of 8,762 listings starting at $3,810
2017 GMC Sierra 1500 For Sale
19 Great Deals out of 933 listings starting at $1,800
2016 GMC Sierra 1500 For Sale
21 Great Deals out of 578 listings starting at $20,988
2015 GMC Sierra 1500 For Sale
47 Great Deals out of 687 listings starting at $14,995
2014 GMC Sierra 1500 For Sale
39 Great Deals out of 394 listings starting at $16,999

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.