Sorry I missed that.

I have checked that before when I was toubleshooting a current draw that turned out to be a stuck antenna.

I'll check it agian though.

I went out to Harry'* in Pennsburg PA today and picked up an engine harness.

I swapped the new one in and it still does the exact same thing.

I also verified it'* definitely not the IAC. I took it out, extended the stopper all the way, put it back in, plugged the harness into a different IAC on a spare TB and started it up. I also adjusted the idle screw so it idled where it normally does. Sure enough, the rpms started bouncing agian.

Any ideas?

This is driving me insane..

This idea popped up into my head..

Would a stretched timing chain and worn dampener, play with the cam timing enough to make it run rough like that with no load?

No load would mean less tension on the chain and possible changes in cam timing.

Two things that make me think I may have worn timing components are:

1. I have about 40k on my cam with 90# LS6 springs but the first 10k were with stock retainers which means the seat pressure was more like 130# for 10k

2. When I crashed with this engine, I bent 3 valves. The bent valves must have been working agianst the cam and working against the timing components.

Anyone think it would be worth it to change the timing chain/dampner?

I'm confused how crashing bent the valves. This does sound like it could be timing related. Is there a chance the timing marks don't line up properly?

Wowzers... I guess you could check into it. See if the cam/crank are lined up properly. That would be crazy if it were the problem.

What about other things like small vacuum leak or PCV issue? I have a hard time believing a stretched timing chain would only manifest itself in no-load conditions. Not saying you're wrong... just thinking out loud.

I bent my rad support into the front valve cover and it caught 3 valves.
The timing marks were definitely aligned when I put the cam in 3 years ago.

I have checked the PCV valve and theres no way any of the ports are clogged.
My vacuum is the same as before too.

Not trying to shoot down ideas either, keep chucking them at me.

Also, what about leaky injectors?

I pulled the plugs this past weekend. They all looked pretty good and were very consistant. They have about 3k on them..

I am also loosing TCC lockup if I hold it at VERY light throttle on the highway.. I can clear the code and it will lock up all day long just as long as I'm going at a steady speed. It won't unlock under load unless it wants to drop down in gear. This leads me to believe the problem is ignition related.. I just don't know how.

Also the cold weather is helping the rpm bounce when decelerating, but it is still there.. The bouncing idle in P/N is the same..

Anyone have any new insight?

TPS is good right?

Vacuum is good...

You've checked compression and know that all valves are sealing 100% right?

It'* nearly as good of a brain teaser as the switch you solved for me a couple years back.

Maybe I missed it, but how are your fuel trims? Any indication of a lean condition?