Hey all, just picked up a 93 del sol s with a jdm d16a swap in it. It has a really weird idle sometimes it will fluctuate up and down up and down and when its not doing that it sits at about 1,500 rpm's. I have been getting terrible gas mileage aswell not sure what I should be looking at first here and or what the problem could possibly be. I know the car was turbo'd before I got it and it even has a fpr installed (not sure if that might be part of the problem).. any help is much apreciated.

 

Clean your IACV and check all vacuum lines? Should help your idle I don't know about you MPG's though.

 

check plugs and wires.

 

Any CEL codes? Have you cleaned and adjusted the FITV?

 

No cel codes and I still have to play with the IACV and FITV,are there any writeups on what Ill be looking for/fixing while I'm in there? I also picked up new oem ngk plugs and some ngk wires I will be installing as soon as they arrive.