How would I go about in diagnosing this? When it's cold, or anything before the fully warmed up state, it runs great, especially when it gets hot enough for vtec, but not fully warmed up.

Could it be a possible vacuum leak?

 

So i searched and searched and couldn't find anything.

I found this thread though which was pretty close, but didn't come with a conclusion! You guys should try to post the solution of your problem more so future honda heads can search!

https://honda-tech.com/forums/honda-civic-del-sol-1992-2000-1/major-loss-power-temperature-related-increase-mpg-2558770/

 

If you hope to get useful replies, then provide all relevant information about your car and engine:

https://honda-tech.com/forums/showpo...48&postcount=2

 

95 cx with a 97 gsr swap, using the 97 gsr harness with an obd1 p72.

Has a lightened flywheel, 11lbs if i remember correctly. Everything else is stock.

I wired secondary butterflys using the power from the injector.

 

LOL, this is the 1st place i would look


Edit: Please step away from the GSR, for the engines sake.

 

**** i swore i read up somewhere thats how you do it.