420A [SOLVED]Horrible idle (I have searched for days)

[me2151]

I know this account was only made a little while ago but I have been searching for days for a fix to my Idle issues. I just bought a '95 Eclipse GS(N/A) with a motor from a Talon(420A). When the car has sat overnight it will idle smooth until it warms up. Once it warms up the car idles at about 750-900 RPM but it is very rough(like its missing). At the same time as the rough idle I can hear the intake sucking increasingly more air in and then the engine starts missing more(RPMs stay about the same). It hesitates to rev until about 4k RPM, from 4k to redline is smooth but once it drops below 4k it runs rough. Another thing to note. If I try to hold the RPMs at anything under 4k despite not moving the throttle position the RPMs fluctuate(hold rev at 3k and it will slowly drop from 3k to 2.5k back up to 3k repeatedly despite not moving my foot).
The car is running VERY rich during all of this other than above 4k(Can smell fuel and lots of carbon buildup on injectors and in intake).

I have done the following:
Cleaned TB(Was filthy)
Tried different ECU(Had spare from Talon or eclipse. I don't know which. Idled good for 5 minutes then issue returned)
Replace TPS
Check spark plugs for Gap(Gapped at 0.034)
Checked wires for spark(Strong Spark)
Monitored O2 voltage(my scanner read 0.185v unless I have it gas then it dropped to 0.00v)
Replace Camshaft Position Sensor(Had CEL for)
Check Timing(Correct)
Disconnect EGR for testing(EGR good)


While it is idling rough I can disconnect the ISC,TPS AND CMP(camshaft sensor) and have NO change in idle.

The main difference that I noticed in my problem compared to everyone else or that I have not found yet is the Intake sound. It is extremely loud when its rough. I will try to get a video tomorrow.

Sometimes if its rough and I give it little jolts of throttle it will smooth out for like 5 seconds then be rough again.

 

[BLACK'98DSM]

There aren't very many vacuum hoses on the 420a. There should be a vacuum line diagram under your hood if nobody has tampered with it.