Hello I Have a 89 GMC 2500 and it hesitates when you start moving but once you get past the intial start it runs fine. You can hear it miss when its idling also. Anyone know what causes this?

Asked by Mar 10, 2014 at 07:20 PM about the GMC Sierra 2500

Question type: Maintenance & Repair

The following has been replaced: Spark plugs and wires, Distributor cap and rotor, oil pressure gauge switch, fuel filter, and  inspected ignition cables

3 Answers

10,965

? Spark or fuel. Is it flooding or leaning out. If it's lean Check the injector spray pattern. If it looks weak check the fuel pressure, I think they are 10 to 13 psi. If the fuel is good check your plugs and the spark at each plug. It may be the pick-up coil or weak ICM. If it's rich (flooding out) the pressure may be too high, NFG regulator in your throttle body???

The Injectors sputter spray when you first apply the gas then it sprays as it should. The spark plugs are clean. I will check the coil and ICM and NFG and see if that's the problem.

10,965

LOL, NFG = No F$%#in Good. Check the spark at the plugs -> pull them out one at a time and ground them to the motor and start the truck. Should see a bright blue spark. If the injectors are spraying incorrectly when the sputtering happens that's were I would look. Once you get it moving it's good but what about if you give it lots of gas, like if you were going to pass someone. That would indicate low fuel flow, plugged fuel filter, partial failure of the fuel regulator or weak pump. Check the first two first as the in tank fuel pump is a dirty job.

1 of 1 people found this helpful.

Your Answer

Sierra 2500

Looking for a Used Sierra 2500 in your area?

CarGurus has 158 nationwide Sierra 2500 listings starting at $5,795.

ZIP:

GMC Sierra 2500 Experts

  • #1
    Rowefast
    Reputation
    160
  • #2
    tennisshoes
    Reputation
    90
  • #3
    JOHNG123
    Reputation
    60
View All

Related Models For Sale

Used GMC Sierra 2500HD
109 Great Deals out of 14,293 listings starting at $2,799
Used GMC Sierra 1500
1,226 Great Deals out of 64,898 listings starting at $999
Used Chevrolet Silverado 2500
9 Great Deals out of 231 listings starting at $3,995
Used Chevrolet Silverado 2500HD
395 Great Deals out of 30,738 listings starting at $1,995
Used Chevrolet Silverado 1500
2,741 Great Deals out of 175,328 listings starting at $955
Used Ford F-250 Super Duty
449 Great Deals out of 49,399 listings starting at $1,899
Used Dodge Ram 2500
153 Great Deals out of 5,465 listings starting at $2,661
Used Ford F-150
3,305 Great Deals out of 224,467 listings starting at $1,200
Used Ford F-250
447 listings starting at $2,500
Used GMC Sierra 1500HD
11 Great Deals out of 136 listings starting at $3,000
Used Ram 2500
198 Great Deals out of 35,372 listings starting at $6,995
Used GMC Sierra 3500
5 Great Deals out of 222 listings starting at $4,400
Used Toyota Tundra
702 Great Deals out of 34,375 listings starting at $1,500
Used Chevrolet C/K 2500
208 listings starting at $2,995
Used GMC Sierra 2500HD Classic
6 Great Deals out of 184 listings starting at $5,250

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.