Hello Guys, i am having some problems with my JDM 7RS here in the UK and am hoping you clever people may be able to help

When i am cruising at light load 60-70 mph the engine will randomly drop into limp mode. If i turn the engine on and off the problem goes away - sometimes for a few seconds, sometimes for a few mins but it always returns.

I also occasionally have a light missfire when accelerating but this is very rare.

The engine light does not come on and i get no fault codes!

My car is a JDM 7RS, stock ECU, stock boost, stock intake, 3" exhaust (cat still fitted).

I have replaced plugs/coils & leads but the problem is still there.

The problem has only started since i had the cam/balance belt changed but i cant link this to the problem. I am back to the tuner who fitted the belt on Wed to investigate but if anyone can suggest any causes it will be a big help.

I have a trackday booked for this Friday so i am getting desperate!

Thanks in advance, Rick