UPDATE: Stuttering at 3k RPM.. has anyone figured this out? --- VIDEO INSIDE

[monty23psk]

Could be. Also have you looked at the coding plug I mentioned above? Its a wild guess but can cause weird issues.

[Brian318is]

No, have not checked the coding plug.. the issue has been developing over the last 3-4 months.

[monty23psk]

If you were close to me we can swap plus and mine is easily accessible since I do not have the cluster bezel installed. Just not sure what part of FL you are in.

[Brian318is]

Ok so, spent an hour with the mechanic today.. he initially thought it was a fuel related problem, but testing fuel pressure and tried using some carb cleaner or something to see if it would rev past 4200 (which is now what it is going to) and it would not.

Then he tested my plugs/coils to make sure they were all working properly.. and they were. We then swapped ECU's (again) and the car still won't rev past 4200 under load.. (if you walk it up, you can take it to about 4500)

He says it is MOST LIKELY a broken valve spring, which would make sense as this problem has been getting worse and worse over the last 4-5 months.

Will pull valve cover and test the springs and report back.

[Brian318is]

Updated Video: http://www.youtube.com/watch?v=sKeFjYPRml0

Took the valve cover off today, dinked around with the springs.. they all looked fine. None of them were any easier to compress than another. Hand cranked the engine and they all compressed, no weird noises or anything out of the ordinary.

Changed my plugs with NGK BKR6EK plugs.. pre-gapped.. my valve tick went away once I changed the plugs.

However, the car is now not revving past 3K.. still stuttering. Warmed the car up all the way, and still sounds like it's hitting rev limiter or missing. I am completely stumped.. the car still idles like a boss and in the video that is with AC on..

Could one of the coils have gone bad?

The car is squealing terribly.. sounds like a belt, but not really.. sounds very metallic.

I checked the water pump not too long ago, the car was still squeaking and everything looked fine..

Completely out of ideas other than maybe a coil plug died or something..

[Brian318is]

Throwing code: 1244.. camshaft sensor. Recently replaced with a brand new OEM camshaft sensor.