Okay so I have a 99gsr swap in my eg, I have owned the car for a number of months and had zero issues with it other than it running rich due the 450cc injectors without a tune. A few days ago I went to one of the local tuning garages and it tuned. It did great on the dyno and ran amazing on the way home (about an hour drive). When I started it the next morning the idle was very rough and bounced from around 1500 to 300 once it warms up it's fine. I've searched around but don't know where to start or if this could be a problem with the tune. I just don't see how it would be a tuning issue when it started and ran fine on the way home. Thanks

 

Did it idle fine before you started driving home? Is the CEL on? Does it work? Have you checked and cleaned your IACV?

 

No cel, it idled fine when I was in their parking lot. And yes the cel does work it's not throwing any though and my iacv was clean when I removed it.

 

Spare ecu laying around for testing?

Can you explain what you mean by idling rough? I've never seen a honda motor idle rough while having it idle from 1500 to 500

 

I just mean bouncing around speraticly. Could it be coming from my buddy club spec 3 cams? It just never did it until after the tune. And no I don't have a spare ecu I'm running a chipped p28. But I am sure that out would run like crap with a stock ecu because of the headwork and injectors. So it would be hard to decipher anything that way.