Hey I got the GSR motor put into my EK. Okay here are a few problems. When the car idles it revs by itself from from 1Krpm up to 2Krpm and goes up and down like that. Anyone know what the problem is?

 

make sure you dont have air in the coolant lines near the thermostat housing.
the IAC sensor is regulated by coolant to determine fast idle when engine is cold. there is a bleed valve on the the thermostat housing, use it to bleed air out of the system. usually this is the cause of the idle hunting.

it could also be the ecu/wiring/vacuum.

wat ecu is it p72?
who installed the motor?
obd2 motor?

~boom

 

Check to make sure you have no vacuum leaks. Check all vacuum hoses. make sure every vacuum hose is plugged in or caped off.