Can you diagnose my problem?

Asked by Smed62 Sep 13, 2020 at 10:31 PM about the 1999 Chevrolet Silverado 1500 Extended Cab 4WD

Question type: Maintenance & Repair

95 Chevy k1500, 5.7 TBI.  200k miles,
started running poorly.  I’ve changed
fuel pump assy, filter, and pressure
regulator, TPS, IAC, air filter,
distributor, cap, rotor, wires, plugs
and the O2 sensor.  I’ve swapped the
injectors and the MAP but it still runs
bad.  Could it be the EGR? It runs
somewhat better if the vac line is
removed from the EGR but it idles
high.  Thanks

2 Answers

Smed62 answered 3 years ago

I have cleaned the throttle body. I replaced the idle air control valve and now it starts ok but after idling for 90- 120 seconds the idle speed surges and falls from 1200 to 500 rpm’s. I’m thinking maybe the ECU needs replaced? I’ve pulled out most of my hair and winter is coming too soon. Any insight would be greatly appreciated. Thank you, Smed62

Mark helpful

Your Answer:

Related Questions

Shortcuts

Search Chevrolet Silverado 1500 Questions

CarGurus Experts

  • #1
    Rowefast
    Reputation
    10,400
  • #2
    John Carson
    Reputation
    9,580
  • #3
    Andrew Olsen
    Reputation
    9,450
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used GMC Sierra 1500
143 Great Deals out of 7,815 listings starting at $5,500
Used Ford F-150
319 Great Deals out of 13,512 listings starting at $3,888
Used Chevrolet Silverado 2500HD
21 Great Deals out of 1,571 listings starting at $5,990
Used Toyota Tundra
36 Great Deals out of 918 listings starting at $10,698
Used Toyota Tacoma
41 Great Deals out of 786 listings starting at $9,975
Used Dodge RAM 1500
80 listings starting at $5,000
Used Chevrolet Tahoe
18 Great Deals out of 779 listings starting at $7,499
Used Ford F-250 Super Duty
28 Great Deals out of 750 listings starting at $3,990
Used Chevrolet Camaro
15 Great Deals out of 465 listings starting at $11,999
Used Ford Mustang
35 Great Deals out of 1,603 listings starting at $7,999
Used Chevrolet Corvette
15 Great Deals out of 777 listings starting at $18,999

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.