So did a 6 bolt swap on my 97 eclipse gst did the cas and everything is wired correctly I’m running into the issue of it running extremely rich I’ve replaced everything from maf, map, idle air control valve, tps, did a boost leak test, new 02 sensor vacuum lines are all deleted including boost restrictor and after replacing all of these parts the car still runs exactly the same even though it’s amazing when i have my foot in it

the car won’t run unless timing is fully advanced and the cas is also not 180 out my coolant temp sensor is good everything seems to check out including compression test but I’m still getting an idle as if it’s misfiring and it also won’t stay idling unless I keep my foot on the pedal

Since you deleted vacuum lines, did you do a full (proper) emissions delete? If not, that might cause some idle surging issues.

spyderdrifter said:

Since you deleted vacuum lines, did you do a full (proper) emissions delete? If not, that might cause some idle surging issues.

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I have no idle surge and I did an egr delete and all vacuum lines including the three on top of throttle body

Still sounds like you have a potential idle problem. I would do a leak down test just to check for any stray leaks.