what about your IAC? Have you tried closing the screw all the way and then giving it 3 complete turns to open it?
I'm having the same problem that you've described here. Except the opposite. Steady at 1100 rpm, rev it and it drops to 650. Happens at every stoplight. I'm thinking it may be my TPS even though it seems to be working properly it's throwing a code. The voltage doesn't rise as I increase the throttle position..it stays below spec at .08v. I'm getting a replacement soon and will post here if it makes a difference. I do have a DE, but the TPS is the same if I recall.i know theres a trick where you take brake cleaner and spray the engine down and if it bogs down it means theres a vac leak, but i didnt find one so i'm pretty sure thats not it, but it doesnt hurt to double check i suppose. when i first installed the ZE i had to use the screw on the throttle lever to lower my idle and that's maxed out now so i can't get it to lower anymore that way.
It initially idles at about 650 right at start untill i rev it. Then it sits at about 1100 and thats with clutch pushed in at idle.
My post above should read "it's NOT throwing a code". Added this because yours isn't either. I've found faulty parts before that weren't showing codes...yeah, the tps is the same so you should deffinently post back if it fixs your problem.
How do you adjust your idle? I've always jumped the TEN and GRND, turn the car on, then adjust to 650rpm. I just tried a different way and so far my idle is rock steady. A little low at around 600, but I can't get it to fluctuate with the clutch like before.yeah, the tps is the same so you should deffinently post back if it fixs your problem.