ok so i just dropped an ls in a hatch it has a gsr ecu (until i get an ls) we got everything running and start up on the first try...but it keeps reving way up to prob 5 grand or so an then dropping down to idle again...we also noticed the check engine light was on so we checked the code which told us it was thethrottle position sensor..so we replaced it and it is still doing it...so then i thought i got the map sensor and the throttle position plug mixed up...that didnt help either if anyone can give me some ideas it would really help thanx

 

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