Engine Missing Rough Idle?

Asked by Aug 20, 2016 at 06:22 PM about the 1998 GMC Sierra 1500 C1500 SLE Extended Cab LB

Question type: Maintenance & Repair

I've got a '98 GMC Sierra
1500c 5.7 liter. The
engine is missing at 50-
60 mph goes away at
70mph. It happens
mainly when its hot or
its been running for a
while. It has also started
to idle a little rough if
left for more than a few
minutes. I've changed
fuel filter and O2 sensor
bank 2 sensor 2 which
O'Reiley's computer
sugested. I can hear the
fuel pump click on when
turning on the ignitio. It
has gotten better but
still running rough. Any
suggestions?

3 Answers

238,105

Missing is related to misfires. Which is related to the ignition system. Check the plugs and wires, distributor, rotor, coil.

1 of 1 people found this helpful.
735

Plug/points/wires/rotor/put high octane gas.keep driving

735

Just did all new to mine.new in 1hour

Your Answer

Add photo

Related Questions

  • Rough idle 12 answers

    Rough idle won't stay running have change elec.spark control, idle air control,plugs,map sensor,tps, and the ecm.. Still running rough but if you unscrew the IAC it idles high but the miss smooths...

    1991 GMC Sierra 1500 C1500 SLE Extended Cab LB

    -

    Maintenance & Repair

  • Idling very rough after a tune up, heck engine light came on. 1 answer

    2012 GMC Sierra 1500 SLT Ext. Cab 4WD

    -

    Maintenance & Repair

  • rough idle, stalling, loss of power. 228 answers

    o2 sensor code 44 (lean) Replaced: coolant temp sensor, tps, map sensor, fuel filter, and o2 sensor. It will run normal on occasion but only lasts about 45 seconds or so. I don't think its the torqu...

    1995 GMC Sierra 1500 K1500 SL 4WD Extended Cab Stepside SB

    -

    Maintenance & Repair

  • Rough idle in cold weather 9 answers

    In cold weather my 2000 sierra starts, reves up idles back down to rough idle and continues to do so for about a minute. Once it warms up runs great and does not do this in warm weather. Have had seve...

    2000 GMC Sierra 1500 SL Standard Cab SB

    -

    Maintenance & Repair

  • Rough idle 9 answers

    I have a 99 Yukon with a 5.7L vortec engine. It had a slight knock since we bought it but it never was a problem. We had some out of town trips planned for this summer so we figured we should fix ...

    1999 GMC Yukon SLE 4WD

    -

    Maintenance & Repair

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 68,199 nationwide Sierra 1500 listings starting at $2,484.

ZIP:

Search GMC Sierra 1500 Questions

GMC Sierra 1500 Experts

#1 dragonflyoffshore
dragonflyoffshore
Reputation 5,010
#2 John Saffrahn
John Saffrahn
Reputation 3,540
#3 Glenn Clingenpeel
Glenn Clingenpeel
Reputation 3,160
View All

Related Models For Sale

Used Chevrolet Silverado 1500
1,718 Great Deals out of 175,751 listings starting at $1,250
Used Ford F-150
2,194 Great Deals out of 206,316 listings starting at $1,499
Used Dodge Ram 1500
453 Great Deals out of 11,151 listings starting at $700
Used Toyota Tacoma
544 Great Deals out of 40,814 listings starting at $2,495
Used GMC Yukon
376 Great Deals out of 18,226 listings starting at $2,950
Used Chevrolet Tahoe
550 Great Deals out of 29,235 listings starting at $1,699
Used Ford F-250 Super Duty
346 Great Deals out of 46,938 listings starting at $1,895
Used Chevrolet Camaro
225 Great Deals out of 30,943 listings starting at $1,217

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
43 Great Deals out of 44,111 listings starting at $20,121
2016 GMC Sierra 1500 For Sale
78 Great Deals out of 3,645 listings starting at $17,888
2015 GMC Sierra 1500 For Sale
102 Great Deals out of 3,926 listings starting at $15,400
2014 GMC Sierra 1500 For Sale
117 Great Deals out of 4,152 listings starting at $14,495
2013 GMC Sierra 1500 For Sale
66 Great Deals out of 2,009 listings starting at $9,600

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.