I had some perfect video of what it was doing but deleted it off my phone via PC by accident.
So let me get the conditions laid down.
NO CEL codes.
When I am at low RPMs and only sometimes, it will drop to below 500 rpms and die. In gear only. Usually on an incline probably because of the load on the tranny in gear at low rpm.
Instead of dying sometimes it will TRY to die but come close and then recover making it surge and buck up and down and up and down till it levels off. If I put my foot on the brake, it dies.
Same thing it was doing before it went to Vengeance.
Also, it seems that when it's hot outside is when it will do it. Not all the time but almost never when cooler out. Could be otherwise but as far as I recall. So maybe just cooincidence too.
This surging and dying is WAY worse when the headers are open with the diverters.
My air conditioner will only work when it's cooler out as well. When the air does work, it blows cold as ever. But when it's real hot out the AC just doesn't work. I wonder if it could be related at all?
Also, I found my EVAP line kinked right where it's braided and is coming out of the rail where the fuel line comes up. I unkinked it but might still be collapsed til I get another one.
I've done a number of things like a smoke test, on the entire manifold and adjacent lines. Checked the fuel pressure. Compression and leakdown test, looked for the header gasket to be leaking.
So my questions are:
Could a kinked EVAP hose cause this?
Could it be related to the air conditioning problem?
What else could it be?