Let us know how you make out with this.

 

Have a look and ensure your iat sensor is plugged in. Also if you can get the car logged it will go a long way towards fixing the problem instead of throwing away money replacing perfectly good parts.

I hope you get it sorted.

 

the same thing just happened to my car...this sucks

 

Have you checked your fuse box? My car started to misfire and ran rich a few days ago and it was caused by the MAF fuse blowing. I don't know if those later model engines had a MAF, but perhaps some other short fuse could cause a similar issue? The fact its only on one bank doesn't really help my suggestion, as it would seem the problem would only be connected to that one bank and not the whole engine, but just a cheap suggestion....

 

200, 200, 195, 185? A 15ps1 difference doesnt sound acceptable to me. But then again you said that was on a cold engine. Considering the pressure drops as you move towards the back of the head, you might consider checking the torque on your head bolts. I think your pressure difference between cylinders is not to be more that 10-14% or something along those lines. Just a thought.

 

Well, I finally found out what the problem was: plugged catalytic converter on the passenger side. I pulled the Y-pipe off, fired the car up and there was no flow at all. Remove the cat, gutted the interior, re-installed and fired it up again. Success!!

This was without-a-doubt, the most frustrating problem I've ever had with a car!! I'm just glad I finally could figure it out!!

 

no offense but 10% of 200 is 20 so in saying that 180 would have been acceptable

 

I agree, plus it was tested on a cold engine.

I have since dyno'd the car - 396 horse, 408 pounds torque. This is still with exhaust manifolds, one cat intact, and non-ported throttle body.