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Thread: Missing 5.3

  1. #1

    Default Missing 5.3

    Hey guys i'm new here.... I have a 99 Z-71 that is running rough. First of all it is really hard starting. Second it will suddenly start skipping, sputtering, and cutting out. For some odd reason if I put it in neutral and shut it down and restart it, it will straighten out for a moment. It is not throwing any diag codes. I have tuned it up, cleaned my K&N, changed the fuel filter and removed the cats....nothing! Any ideas?:na:

  2. #2


    Welcome to the site. I "assume" you have checked out the fuel filter, since you said you tuned it up. The other thing I might look at is the mass air sensor, since you said you had cleaned the K & N. Did the problem just start suddenly or did it just deteriorate?

    2010 Z/71 Colorado C/C
    Black 4X4 w/5.3L V8
    2007 Winnebago Adventurer
    w/8.1L Chevy & Allison 6spd.
    Canyon Lake, Texas

  3. #3


    YeahI changed the fuel filter also. It started happening suddenly. It worked itself out for about a month and is doing it again it' really weird. Are these computers prone to going bad? How can I check the MAF? Thanks

  4. #4


    On the MAF sensor, the problem I heard of comes from getting oil on the "wires" from cleaning the K & N. You have to be very careful as the wires are delicate. It seems that when "re-oiling" the clean filter a little too much oil goes a long way. Might be worth a try.

  5. #5


    Yes MAF sensors are VERY sensitive since they work on frequency. Also, you may want to check/replace cap, rotor, wires and plugs if you didn't do so already.


    '94 Chevy Suburban K1500
    3" exhaust w/ aero turbine non-baffled muffler
    CFM Technologies TB spacer
    CB w/ 44" whip antenna

  6. #6


    Well I don't have a cap or rotor but plugs are new and wires are fine.... the truck doesn't do this all of the time.... just when it wants to so I don't think its anything like that. I'll definately check the maf though. Thanks guys!

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