99' chevy 5.7L suburban Vortex engine misfires at high speed when engine revs up over 3000 RPM

Asked by Jan 28, 2017 at 04:24 PM about the 1999 Chevrolet C/K 1500 LS 4WD

Question type: Maintenance & Repair

a new spider, distributer, coil and fuel pump have been installed along with all
ignition wires and plugs

5 Answers

checked all those. It really appears electrical since the misfirre is very rapid and constant. if I let off on the gas pedal the engine resets and then all works great again.

98,345

Had a Tahoe that would do the same thing found out is was an intake gasket leak, causing a lean reading on number 3 and 5 cylinders, but could only feel a single misfire. Replaced the gaskets and no more problem, but tranny man is right about having it live data scanned, so the fuel trims can be seen in real time and if anything else is out whack.

I actually had the intake gasket replaced too!

98,345

Then go for a live data scan.

73,025

May want to check the engine compression.

Your Answer

Add photo

Related Questions

C/K 1500

Looking for a Used C/K 1500 in your area?

CarGurus has 14 nationwide C/K 1500 listings and the tools to find you a great deal.

Postal Code:

Search Chevrolet C/K 1500 Questions

Chevrolet C/K 1500 Experts

#1 Andrew Olsen
Andrew Olsen
Reputation 3,550
#2 John Saffrahn
John Saffrahn
Reputation 2,550
#3 Rowefast
Rowefast
Reputation 2,150
View All

Related Models For Sale

Used Chevrolet Silverado 1500
165 Great Deals out of 10,495 listings starting at $100
Used GMC Sierra 1500
223 Great Deals out of 10,204 listings starting at $2,995
Used Ford F-150
429 Great Deals out of 9,031 listings starting at $922
Used Dodge Ram 1500
58 Great Deals out of 529 listings starting at $2,995
Used Chevrolet Tahoe
7 Great Deals out of 618 listings starting at $6,871
Used Toyota Tacoma
35 Great Deals out of 803 listings starting at $5,995
Used Chevrolet Camaro
781 listings starting at $13,040
Used Chevrolet S-10
12 listings starting at $3,800
Used Toyota Tundra
16 Great Deals out of 785 listings starting at $4,499

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.