Zoltan Posted October 16, 2019 Share Posted October 16, 2019 So its a 2003 Forester with a NA Ej25 and automatic. I just put in a low milage EJ25 NA motor (60 000 miles) that had new head gaskets installed by the previous owner. I have no way of verifying the true milage of this motor as I just bought it and took the person word for it. I put it in my forester and used the intake from the forester and the motor surges up and down about 400rpm . It does this in park idling, and also under load while driving. I cant see any connections I missed. Any suggestions. Thanks for taking the time to read this. Quote Link to comment Share on other sites More sharing options...
rverdoold Posted October 22, 2019 Share Posted October 22, 2019 I would bet on a vacuum leak somewhere in the inlet manifold system. Or timing belt is off a tooth but that should not result in surging. Quote Link to comment Share on other sites More sharing options...
Zoltan Posted October 22, 2019 Author Share Posted October 22, 2019 Ok thanks. I will check it out. Problem also seems to be a bit intermittent. So its a tough one. Quote Link to comment Share on other sites More sharing options...
heartless Posted October 22, 2019 Share Posted October 22, 2019 yeah, triple check all vacuum lines - if any are are "hard", replace them. Quote Link to comment Share on other sites More sharing options...
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