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Username Post: 2000 GMC Sierra 5.7 Running rough, missing        (Topic#166771)
Posts: 3

Reg: 05-04-07
08-08-07 10:43 AM - Post#1226947    

Hi All,
I have a 2000 GMC Sierra SLE 4 door 4x4 with 5.7. 111,000 miles. Just recently it has started missing as Im cruising the highway. Problem more prominent when engine hot or been running a while.. say after 10 miles. Started with the occasional miss now doing this more often. Has not set off any trouble codes or dash light. Almost feels like a fouled distributer cap/rotor, but there is not one in these trucks. Idle is good, but it did feel like it was going to stall on me once yesterday.
Any Ideas???

black tie 
Silver Supporting Member
Posts: 236

Loc: Atlanta georgia
Reg: 01-04-05
08-08-07 11:53 AM - Post#1226972    
    In response to Hanny

Hi Hanny, I'm not sure what maintenance you have done so far but here is a general idea on how to get it running again...1st do a seafoam treatment through the brake booster hose...may be all you need but the next step would be a fuel filter replacement and a large bottle of techron or redline fuel system cleaner...If that doesnt do it then it may need plugs and wires...If you do this only use A/C Delco plug wires and OE plugs... dont skimp and get cheap wires as they just dont work on these trucks....My 2002 5.3 has NGK plugs and thats what I went back with and so far have had no problems...You should also clean the throttle valve with some seafoam on a rag to remove the carbon...While doing this its a good time to remove the MAF from the intake and clean it with the proper spray cleaner, either electronic cleaner or special MAF spray cleaner that NAPA sells....Button everything back up and do an oil/filter you can go out on the interstate and do a redneck tune up which is to mash it hard and hold it to the floor to clean everything out...very effective and quite fun but be safe about your truck should run just like new but if not then take it to a pro and let them do a fuel injector cleaning and troubleshoot what might be wrong....good luck guy and let us know if this takes care of your problem...

What I really need is an open road and a whole lotta speed

Edited by black tie on 08-08-07 12:01 PM. Reason for edit: No reason given.

Posts: 3

Reg: 05-04-07
08-08-07 12:50 PM - Post#1227007    
    In response to black tie

Thanks Black Tie!
I just purchased the truck about 2 mo ago, so not sure of the maintenance, but it looks like it was owned by an old man and super clean. I just changed oil the other day. It probably was driven slow, so I will run cleaner through it and change gas filter. I just picked up spark plugs as Im guessing everything is still original equipment. I got Bosch Platinums (first time using these) so will see how that works. I have a feeling the problem may be in the MAF but will try cleaning it first.
Im going to hit the road and drive it hard to see if I can throw off a code, but so far I havent been successful and its holding to its secrets.
I have an 8 hour drive ahead of me on Friday.. so hoping its going to get me there! LOL
Thanks for your help and Ill keep you posted.

Bad Bowtie 
Valued Contributor
Posts: 4785
Bad Bowtie
Age: 45
Loc: TX
Reg: 07-04-03
08-08-07 12:53 PM - Post#1227011    
    In response to Hanny

Do EVERYTHING "black tie" said, he is on the right track I do believe....

GMC. We are Professional Grade.

Senior Member
Posts: 737

Loc: Naperville, IL
Reg: 04-05-04
08-08-07 01:00 PM - Post#1227016    
    In response to Bad Bowtie

  • Quote:
...You should also clean the throttle valve with some seafoam on a rag to remove the carbon...While doing this its a good time to remove the MAF from the intake and clean it with the proper spray cleaner

Anybody have any good DIY's with pictures or detailed instructions on how to do this?

If it ain't broke open it up and make it better 03 Silverado 5.3 Z71

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