Very odd stutter

[Cablefed]

Well just when you think you know your car really well I'm stumped on this one. I took my car in this morning to have the rear glass replaced, again for the second time, and the car did not want to go past 3K RPM's. The car would go to about 60 or 70 MPH and then stutter and shake. I noticed the EGT temp was at 600 degrees F. The car does not even produce that cold of a temp at idle. Every other 10 seconds the EGT's would rapidly rise to what they are suppose to be then rapidly fall to 600. When I dropped the car off I checked the sparkplug boots to make sure they were nice and secure and also checked the turbo to make sure it was not seized 8), and the EGT probe to make sure it did not fall out. I still had the studder in the throttle respose every other pull of the throttle cable while under the hood. I did not have any time to really start troubleshooting the problem right there. I told the my body shop guy that the car runs just to drive it like a grandma when he drives it to the tint shop.

Now the car did sit in my garage and had not been ran for almost two weeks with an engine bath done before I put her away. I assume that maybe somewhere in the ingition system I have water or worse I have water that got frozen in a part and expanded. My garage is not yet heated and you can't always get the engine completly dry after a bath and with the cold weather we have had maybe some water got frozen and got into something it should'nt have.

I just wanted to know if anyone had any suggestions as to what it might be. My first place to check is going to be in the ignition system starting at the sparkplugs and moving my way back to the coil pack and transistor. Any thoughts??? Thanks in advance for any input.

 

[trebornash]

Just some opinions that's all:
Fuel filter,converter,injectors,coil pak.
In that order.
I get lotsa vehicles in
from mechanics swearing the converter
is bad. 80% of the time it's just a fuel filter.

DSMs have a mind of their own tho,.

 

[Cablefed]

well the filter is brand new, but I won't rule it out as it will go on the bottom of list. The first thing is to check the obvious things. The car ran like a champ before I put her away for two weeks.