96 Silverado new everything, but sputters at hiway speed ...

Asked by Pumped96Silverado Jun 08, 2017 at 06:00 AM about the 1999 Chevrolet Silverado 1500 LS Extended Cab RWD

Question type: Maintenance & Repair

I  have a 1996 5.7L Vortec TBI, Silverado, brand new CRATE Engine form the factory, new distributor & distributor cap rotor plugs, wires, fuel injection conversion, all professionaly installed.Runs great, however when I am at 70Mph and back off the accelerator slightly, the truck miss fires or sputters, enough that it jerks as if the power to the coil was shut off and back on again.It doesnt seem to be an issue at lower speeds 35 to 45 MPH.  Also just had the tranny professionaly rebuilt and shift kit installed. Connected to my ODBII and get a miss fire or cross fire code

1 Answer
220,815

Rowefast answered 6 years ago

Since this is a new engine, the miss-fire code should have told you what cylinder to look at for the miss-fire. Concentrate on that cylinder for problems, electrical connections, check the wiring, check the spark plug, check the compression in that cylinder, it should be around 155 lbs. maybe a valve adjustment. You computer would have needed to be reprogrammed also to run the MPFI from the TBI set-up. I am assuming the intake manifold and throttle body are new? Because if it where not, possibly the Throttle Positioning Sensor may have a dead spot in it. Another thing that would have had to be new would be the EGR valve. Just go over the engine to look for problems, make sure the EGR system is hooked up correctly. I don't have much time this morning, have to work, but would be back later today.

Mark helpful

Your Answer:

Related Questions

  • 96 Silverado new everything, but sputters at hiway speed ... 1 Answer

    I have a 1996 5.7L Vortec TBI, Silverado, brand new CRATE Engine form the factory, new distributor & distributor cap rotor plugs, wires, fuel injection conversion, all professionaly installed.Runs gr...

    1999 Chevrolet Silverado 1500 LS Extended Cab RWD

    -

    Maintenance & Repair

  • Silverado Sputters during acceleration 17 Answers

    I have a 2008 model Silverado, 6 cylinder. About 6 months ago, I noticed the engine sputtering or missing when I would accelerate (going up a grade or passing a truck). If I back off the gas, it seems...

    2008 Chevrolet Silverado 1500 1LT RWD

    -

    Maintenance & Repair

  • Speed limiter- 2000 Silverado 2 Answers

    So I have been searching the Internet and my owners manual for a reputable source to state if my 2000 Silverado has a factory installed speed limiter and if so, at what speed does it get cut off ...

    2000 Chevrolet Silverado 1500 LS Extended Cab LB RWD

    -

    Maintenance & Repair

  • 2019 Chevy Silverado sputters and dies when its hot outside 1 Answer

    My 2019 silverado sputters and dies when its hot outside. Truck has a 5.3 with only 16,000 miles. It doesn't set a code. If you wait about 10 minutes you can start it back up. Possibly a bad fue...

    2019 Chevrolet Silverado 1500

    -

    Maintenance & Repair

  • 05 Silverado 4.3 5 speed 1 Answer

    05 silverado 4.3 5 speed has new oil pump rebuilt distributor new plugs and wires the truck turns over for maybe 5 seconds then it cuts all power but soon as you let off of the key the power comes ...

    2005 Chevrolet Silverado 1500 RWD

    -

    Maintenance & Repair

Shortcuts

Search Chevrolet Silverado 1500 Questions

CarGurus Experts

  • #1
    Rowefast
    Reputation
    10,390
  • #2
    John Carson
    Reputation
    9,560
  • #3
    Andrew Olsen
    Reputation
    9,390
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used GMC Sierra 1500
160 Great Deals out of 8,385 listings starting at $5,975
Used Ford F-150
343 Great Deals out of 13,334 listings starting at $3,000
Used Chevrolet Silverado 2500HD
35 Great Deals out of 1,704 listings starting at $3,995
Used Toyota Tundra
27 Great Deals out of 987 listings starting at $10,698
Used Dodge RAM 1500
93 listings starting at $9,594
Used Toyota Tacoma
29 Great Deals out of 712 listings starting at $9,975
Used Chevrolet Tahoe
10 Great Deals out of 830 listings starting at $698
Used Chevrolet Camaro
14 Great Deals out of 478 listings starting at $11,995
Used Ford F-250 Super Duty
26 Great Deals out of 774 listings starting at $4,290
Used Ford Mustang
57 Great Deals out of 1,657 listings starting at $6,977
Used Chevrolet Corvette
24 Great Deals out of 647 listings starting at $10,989

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. Content will be removed if CarGurus becomes aware that it violates our policies.