1998 Chevy Silverado misfiring rapidly! Help please!

30

Asked by Sep 18, 2016 at 08:17 AM about the 1999 Chevrolet Silverado 1500 3 Dr STD 4WD Extended Cab SB

Question type: Maintenance & Repair

I was driving my truck the other day and it was
running fine and all of a sudden it started running
extremely rough and misfiring like crazy. It also
started running really rich and also gas is leaking
out exhaust pipes. Changed the spark plugs last
night and it was doing the exact same thing if not
worse than before. What could it be?

8 Answers

275,855

If it was misfiring, you would have a Check engine light, did you scan for codes yet?

21,130

Sounds like a bad fuel pressure regulator.

30

Yeah the check engine light is on and it flashes as well which means misfire I think. Also about a year ago the catalytic converter was removed and it was straight piped. Not sure if this would have something to do with it.

30

Codes say that Bank 1 and Bank 2 lean. And multiple misfire.

32,895

You have fuel dripping out of tail pipe and a computer that thinks it's running lean. I'd check for a vacuum leak, fuel pressure, and the O2 sensor is going to give false readings to the ECU without the cat present.

32,895

^ and that's assuming you don't have any actual mechanical trouble like a bad knock/cam/crank sensor or timing chain.

30

I'll check those today. It just shakes the truck to pieces when you give it gas. It's got a bad miss to it.

1 of 1 people found this helpful.
935

Water,water,water. Get rid of it. Drain. Tank

Your Answer

Silverado 1500

Looking for a Used Silverado 1500 in your area?

CarGurus has 157,672 nationwide Silverado 1500 listings starting at $1,500.

ZIP:

Chevrolet Silverado 1500 Experts

  • #1
    John Carson
    Reputation
    3,080
  • #2
    Rowefast
    Reputation
    2,200
  • #3
    Andrew Olsen
    Reputation
    1,960
View All

Related Models For Sale

Used GMC Sierra 1500
1,084 Great Deals out of 61,718 listings starting at $1,295
Used Ford F-150
2,943 Great Deals out of 230,829 listings starting at $1,300
Used Dodge Ram 1500
295 Great Deals out of 10,490 listings starting at $1,995
Used Toyota Tundra
611 Great Deals out of 36,207 listings starting at $1,500
Used Toyota Tacoma
550 Great Deals out of 41,072 listings starting at $2,999
Used Chevrolet Tahoe
784 Great Deals out of 40,137 listings starting at $1,799
Used Ford F-250 Super Duty
403 Great Deals out of 47,758 listings starting at $1,700
Used Chevrolet Camaro
358 Great Deals out of 31,467 listings starting at $3,495
Used Ford Mustang
332 Great Deals out of 41,500 listings starting at $1,488

Used Cars For Sale

2018 Chevrolet Silverado 1500 For Sale
10 Great Deals out of 85,764 listings starting at $17,963
2017 Chevrolet Silverado 1500 For Sale
217 Great Deals out of 13,841 listings starting at $17,819
2016 Chevrolet Silverado 1500 For Sale
262 Great Deals out of 7,063 listings starting at $16,644
2015 Chevrolet Silverado 1500 For Sale
442 Great Deals out of 11,305 listings starting at $11,494
2014 Chevrolet Silverado 1500 For Sale
441 Great Deals out of 10,249 listings starting at $8,950

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.