put your old throttle body back on......your new throttle body probaly has a bad sensor for tps and or map. check the gaskets on those sensors. you can change the tps and or map for your old sensors on your old throttle body. but why go through all that work....your old throttle body seemed to work just fine. any check engine codes with your old sensor? find your ecu and tell us what ecu is in the car. read the numbers for us. now check your vtec solenoid....where are those wires running to?

as for the seal?.......there are two diffrnet part numbers for the left and right seals. my guess is that you or the mechanic got the worng one. the mechanic should have known that that seal wouldnt fit. go get a seal for your tranny...so maybe gsr drivers side?