Runs rough.

Asked by Nov 09, 2014 at 07:16 AM about the 1991 GMC Sonoma

Question type: Maintenance & Repair

It idles fine, but when I get into third
or more, or if I'm idling in second, it
runs really rough.But when the
service engine soon light comes on, it
runs fine. what's wrong? please help

2 Answers

10,070

you will have to read that engine code. sounds like the computer is trying to compensate for something. Google "how to read OBD1 codes with a paper clip" you will get a simple procedure for reading the code.

1 out of 1 people think this is helpful.
35

mine wasn't that old sounds like o2 sensor or emission problem go to and auto parts that will read your codes for free parts. for your truck are fairly cheap so even if you have to replace a couple of sensors it won't cost a arm &a leg .iban

Your Answer

Add photo

Related Questions

Search GMC Sonoma Questions

GMC Sonoma Experts

#1 parkle
parkle
Reputation 630
#2 Mike Bonnell
Mike Bonnell
Reputation 420
#3 James Mayfield
James Mayfield
Reputation 290
View All

Related Models For Sale

Used Chevrolet S-10
9 Great Deals out of 1,636 listings starting at $2,450
Used Ford Ranger
228 Great Deals out of 6,966 listings starting at $1,500
Used Ford F-150
3,391 Great Deals out of 203,570 listings starting at $1,273
Used GMC Sierra 1500
1,156 Great Deals out of 57,808 listings starting at $995
Used Dodge Dakota
117 Great Deals out of 4,351 listings starting at $995
Used Chevrolet Camaro
645 Great Deals out of 39,147 listings starting at $2,995
Used Mazda B-Series Pickup
207 listings starting at $1,995

Used Cars For Sale

2003 GMC Sonoma For Sale
3 Great Deals out of 87 listings starting at $2,999
2002 GMC Sonoma For Sale
3 Great Deals out of 86 listings starting at $1,500
2001 GMC Sonoma For Sale
75 listings starting at $2,995
2000 GMC Sonoma For Sale
79 listings starting at $2,875
1999 GMC Sonoma For Sale
40 listings starting at $3,450