99 Jimmy engine question

5

Asked by Jan 12, 2017 at 01:45 PM about the 1999 GMC Jimmy 4 Dr SLT 4WD SUV

Question type: Maintenance & Repair

My Jimmy is acting up again... I can
drive it for a while and it's all good
then all of a sudden, if I yet to slow
down, the rpms go up and the engine
revs, truck tries to accelerate .
Breaking is a challenge.  Finally  the
rpms go down and the moment I let
off the break, the rpms jump back up
like I'm trying to race.    It seems to
stick at like between 10- 30 mph.  I'm
worried about it.  Idk if it's a throttle
position sensor or my transmission
or accelerate cable hanging up.  .
Confusing.  Also my engine light is on
but I think it is because of my o2
sensor needing replaced.  

1 Answer

76,235

You should get the codes read to know for sure. It could be the Throttle Position Sensor, the Idle Air Control, or the Mass Air Flow Sensor. Checking the codes would point you in the right direction. If it is the Idle Air Control, it is very important to clean out the port good, even taking the throttle body off to do it.

1 of 1 people found this helpful.

Your Answer

GMC Jimmy Experts

  • #1
    Andrew Olsen
    Reputation
    310
  • #2
    1oldman
    Reputation
    270
  • #2
    tennisshoes
    Reputation
    270
View All

Related Models For Sale

Used Chevrolet Blazer
3 Great Deals out of 944 listings starting at $950
Used GMC Sierra 1500
1,155 Great Deals out of 64,157 listings starting at $999
Used GMC Yukon
590 Great Deals out of 20,734 listings starting at $2,695
Used GMC Envoy
46 Great Deals out of 1,994 listings starting at $1,500
Used Chevrolet S-10
12 Great Deals out of 1,234 listings starting at $1,550
Used Chevrolet Camaro
442 Great Deals out of 31,240 listings starting at $1,450
Used Chevrolet Tahoe
824 Great Deals out of 41,549 listings starting at $1,987
Used Ford Explorer
1,195 Great Deals out of 68,629 listings starting at $750
Used Jeep Cherokee
497 Great Deals out of 60,769 listings starting at $1,995
Used GMC Sonoma
5 Great Deals out of 419 listings starting at $1,900
Used Ford F-150
3,183 Great Deals out of 218,644 listings starting at $1,200
Used Jeep Grand Cherokee
1,056 Great Deals out of 71,467 listings starting at $1,195
Used Ford Ranger
194 Great Deals out of 5,513 listings starting at $1,800

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.