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Discussion Starter #1
92 2wd 4.3 tbi


This is my uncles truck. when he starts it up to warm it will idle fine for a few minutes, then it will slow down till it chugs and almost dies, then speeds way up and roars the piss out of it self. it will do this for a while then it will level out and idle right.

do any of you guys have any suggestions.

any help will be appreciated thanks

josh
 

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PCV valve

My truck was doing the exact same thing, but not to the point that it would kill itself. I got a repair manual for my truck and it said to check the PCV valve and it checked out fine. But the hose that it was hooked up to had a crack in it at an elbow causing a vacuum leak. I went to Advance auto parts and got a hose from thier "emissions isle" and it runs like a champ now. I got the truck with right at 100000 miles on the odo. :afro:
 

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Clean N' Dark
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IAC Valve (Idle Air Control)

It's defective. Swap it out and it should be fine.
 

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Discussion Starter #4
ok thanks
 
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