Car shuts down at about 3500rpm /w marked vibration

[Whammydill]

As the title says. my car will begin vibrating pretty bad at the 3-4k rpm range, in any gear. I won't get a lot of response from the throttle at this point and more often than not the car will die out, giving CEL and other indicators on the dash come on. I also lose power-steering. The shut down happens usually when in the 60mph+ or more range It feels like its associated with the vibration though........Is this an ignition problem? The vibration gives a lot of feedback through the tranny, dunno if its that, some kind of balance problem, or even my tires out of balance though they shouldn't be. I don't see how the tires would make it shut down though. Any thoughts?

 

[DSM90AWD]

Check all the intake and intercooler connections. Could also be ignition: cracked wires, fouled plugs. Fuel filter of known age/condition?

 

[Spoolin4Ever]

TPS maybe

What about in neutral if you free rev to 4 or 5k as an example?

 

[Defiant]

Sounds like a few problems, but one of them is probably that your rear balance shaft is 180° out of phase.

 

[DarkEagleTSi]

I'm not sure if this is the right place off my problem but here I go!
No Leaks. Boost builds fast. Plugs and Wires are New. Freshly Rebuilt motor. New Injectors. New ECU. I was in the process of breaking in the motor. I had put 400miles when I decided to stop babying it so much and start pushing it a little more. Changed the Oil & filter and proceeded. I could not get the motor past 4000RPM. I was scratching my head. Consulted with the engine installer and the engine builder, but they were also clueless. I needed the car for work so I drove it for two days under 4K. I noticed that my Air/Fuel meter showed a Lean condition 75% of the time. On the third day, the car wouldn't go anywhere. It Idles just fine (750). It does not go though. Runs like it is overheated. No power whatsoever at anytime!!! I was able to get it home by fluttering the gas pedal. Lightly on, then off, then quickly back on, then off, then again and again. The car started running again like nothing and the A/F showed stoich and rich. ????????
At home in my driveway I noticed that my vacuum is very poor, like 8in/Hg.

What the HECK??? Please help me!!!

 

[DarkEagleTSi]

balance shafts were out of phase!
sorry 4 delay. thnx guys