Rough idle

[525JoeComanche]

Hey everyone, I posted recently about my issue, but I’m still at a loss, and am going to try to explain better what’s going on. I just put a motor in this truck, the motor was fully rebuilt with low miles on it, I know the motor is good. Okay, so here’s the issue, I’ve gotten it running, and above idle speed, it runs smooth as could be, but idling it runs like crap, inconsistent idle speed as well as running like crap, smelly exhaust too. Things I’ve done, new plugs and cap and rotor, checked for vacuum leaks, cleaned throttle body, and IAC valve, replaced o2 sensor, cleaned c101 connector, cleaned all grounds, changed egr valve, one thing I’ll say is that when I was testing the egr valve, unplugging the vacuum line to the egr valve made zero difference in how it ran, does that mean anything to anyone? Issue is at its worst on cold startup, gets better once warmed up for 20 minutes or so, but still isn’t great. Doesn’t effect driving, and runs great under a load except releasing clutch when starting off will hesitate if engine speed is around the speed of the idle. Please help! ***Update*** wasn’t getting much vacuum anywhere, pulled this piece out and saw that it was clogged! I was delighted to see that I found my problem, put in a clean one, and have great vacuum now! But guess what? Runs 100% the same, like crap.

[jdog]

Assuming it's a renix Era 4.0 I'd be looking at the map sensor and vacuum

[jdog]

http://cruiser54.com/?p=68

http://cruiser54.com/?p=280

http://cruiser54.com/?p=19

[cruiser54]

THIS ^^^^^

[525JoeComanche]

Thanks for the replies everyone, regarding my map sensor, sensor and vacuum line to sensor are good. As for your tips cruiser, I’ve completed a lot of them, but I will definitely go through them again carefully to see what I haven’t completed.