turkeyneck29
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- Joined
- Jan 7, 2013
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idk if im posting in the right area but here it is. I have a 97 k1500 with a newly installed 98 4.3(out of s10) in it. The engine runs great but the idol is very messed up. As soon as i turn the truck on it goes straight to 2500-3000 rpms then within 5-7 seconds slowly drops down to 700-1000 rpms but OCCASIONALLY starts up right and goes straight to 500-700 rpms. Also when i drive i can press the clutch and it goes up to 2500-3000 rpms but agin OCCASIONALLY will run right and go to 500-700 rpms. When i stop as i slow down it stays at 2500-3000rpm until ive stood still for a few seconds it starts to go down. I get around 9-12 mpg witch sounds horrible for a standerd v6 single cab. As much as i reset the computer the engine light stays on and throws different codes every time i check it. tps censor, egr valve, pintle position 10% off, missfire, knock censor, 02 censor, to lean/rich, its different every time. I changed spark plugs, wires, distributor, fuel injection spider, cleaned the whole block before installing it and a bunch of other stuff that wouldn't affect idol. Since its been installed ive tried 3 different egr valves, cleaning egr port, brand new tps censor, brand new iac censor and checked this thing inside and out for vaccume leaks. Im sure im missing something but ive spent way to much time and money for it to still have a bad idol. The one thing that could affect something is that there is a hairline crack in the intake manifold where the scre is the screw down the air intake but i wouldn't think that would be the problem is it runs good sometimes then dosent run good and on top of this no vaccume leak code is coming up. I need help if anyone has had this same problem.