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Discussion Starter #1
well not really missing, it's sitting right out side the window here.

but it does run like poop!

it's a 99 k1500 350/auto gas. just turned 75,000 miles

it threw a code back in january and I thought it was the trans. a trans shop
loooked at it and said it was multiple misfires multiple cyl.

I replaced plugs, wires, cap, and rotor. it ran alot better but lately it's been missing more and more. I found that my preditor tuner for my camaro would pull codes.

pulled a code p030 multiple misfires multiple cyl.

I have also ran two bottles of injection cleaner in the tank.

don't have the money for a shop right now

any segestions ???

thanks!
 

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My 2000 Sierra (4.8L) was shifting poorly,breaking down on ecceleration,but not doing this all of the time.I changed the Mass Air Flow Sensor and the truck works excellent now.
Maybe it is simple as moisture or a little corrosion on a sensor plug end.What if you tried running the truck at night to see if there is any arcing under the hood .
Good luck.
 

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Discussion Starter #3
thanks, I'll give that a try tonight.

does seem to make a difference as to morning,day, night, rain or sunshine.
 

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my escort was having a similar issue last year. I cleaned the cam and crank position sensors. The engine did not know which jug to fire on so it was firing and fueling all of them. The tailpipe was black and my mpg was real bad.
 

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I think on a 99 they are a non fuel return back to the tank. It might have sediments in the injectors. just a thought
 

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You have to get it on a scanner that will read the computer correctly. With computer controlled engines, throwing parts at it is the last thing you want to do. Unless you are lucky, and guess the right part the first time, it can be far more expensive than taking it to a shop. A good tech with a good scanner should be able to narrow down the problem in a few minutes.

Randy (spend a little to save a lot!);)
 

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72GreenRally said:
You have to get it on a scanner that will read the computer correctly. With computer controlled engines, throwing parts at it is the last thing you want to do. Unless you are lucky, and guess the right part the first time, it can be far more expensive than taking it to a shop. A good tech with a good scanner should be able to narrow down the problem in a few minutes.

Randy (spend a little to save a lot!);)

Good point. Thier diagnostic scanner will pick throught things that the tuner will never find.
 

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My 97 tahoe had the same problem. It ended up being the fuel injectors located in inside the intake.I changed everything, kept misfiring.I took it to Chevy dealer it had some sort of recall where injectors are failing.They were replaced at no charge!:cool:
 

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Discussion Starter #9
have had it on the computer 3 times.

1st time said #6 inj. and the reg
changed those out still missing

2nd time said fuel press verying.

change fuel pump out still missing

3rd time said all was fine, ran good while on a test drive, left the shop and it started again, talked to them and they segested the EGR.

changed out the EGR and screened gasket, still missing.

at the shop again, but this will be the last time and I will search out a new shop.

Iam in to nearly 1000.00 and my labor and still have the same problem.:mad:
 

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Might want to try droping the convertor it might be pluged up some. You'll have to totally disconect it from exhaust hold it up with some wire and drive it.
 

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Ok this may sound simple, but hey.. I did it. When you changed the plugs/wires did you put good replacements on? Platinum plugs included. I thought I would get out cheap with my Yukon on changing the plugs/wires with some Autozone wires and cheap plugs. It barely ran. Sooo back to autozone to get some good wires and plat. plugs. Then it ran fine. Sold it with 298,000 miles last year. :D Off topic it sucks to pay $28,000 for a vehicle then selling it for $2,500. :mad:
 

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Discussion Starter #12
HMMMMMMMMMM!

maybe autozone owns me, but I think I bought good wires and AC plugs
 
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