k i put a 97 gsr engine in my 99 civic and it wont idle unless i give it throttle, thenit idles low no matter what, then when warm idles ok if i am not getting vacuum to the fpr could that cause this issue or the egr valve on top maybe it is not plugged in

 

They make cars with sensors and vaccumn lines for a reason, if they were meant to be ran without **** hooked up then whats the point of putting them in, ANYTHING thats not connected will cause a problem, so fix em

 

ha ok well when i pull the vacuum line from the fpr it idles normal anyone else have this issue with a swapped gsr in 96-00 civic