My girl has an 02 diamonte ls. Changed the thermostat in it. Thays all i did. Didnt mess with anything else. Now its throwing p1101 which is tcs vacuum solenoid and wont raise above 2k rps or 20 mph. Tried resetting ecu did nothing. Any solutions? I built my 468 hp h2b civic and have a 400+ hp 300zx and have never seen anything like this. Any help would be much appreciated.

 

You miss a vacuum line or electrical connector or something somewhere that may have popped loose?