I have a 1996 gmc truck 4.3 v6 I replace my spakplugs and wires the coolant temp sensor. check engine light went off ran good for a couple of days now light is back on and truck doesn't want to start than when it does it runs really ruff till it is warmed up. any help would be welcomed

100

Asked by timvk Jun 10, 2014 at 09:33 AM about the 1996 GMC Sierra 1500 C1500 SL Extended Cab LB

Question type: Maintenance & Repair

3 Answers

100

read out p0300 says ignition system fault-plugs wires or coil; vacuum leak injector fault or high or low fuel pressure..p0420 says catalytic converter defective failure possible due to number 2 3 or 4 engine misfire or running condidtion large vacuum leak seals, piston rings

100

update.. have not fixed anything yet.. I left my battery un hooked for about an hour hooked it up turned the key and it fired up on first try.. so I don't know what that means.. don't know if I checked spark wrong is why thought it had no spark or if the reset fixed that... does this mean my mass air flow sensor is bad

Your Answer:

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 8,237 nationwide Sierra 1500 listings starting at $3,000.

Postal Code:

CarGurus Experts

  • #1
    yetilikesbeer
    Reputation
    12,350
  • #2
    dragonflyoffshore
    Reputation
    11,500
  • #3
    John Saffrahn
    Reputation
    11,440
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Ford F-150
310 Great Deals out of 13,812 listings starting at $3,800
Used Toyota Tacoma
40 Great Deals out of 741 listings starting at $9,975
Used GMC Yukon
15 Great Deals out of 980 listings starting at $3,000
Used Dodge RAM 1500
91 listings starting at $2,500
Used Chevrolet Tahoe
13 Great Deals out of 815 listings starting at $9,980
Used Chevrolet Camaro
16 Great Deals out of 469 listings starting at $11,749

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.