I have a 90 efi xr3i which is hard to start and will not idle properly (cutting out after Revving)
When u remove the plug from the air temp sensor it idle,s so i put a new sensor in and it started doin it again?????????????????????
Its had new leads plugs and a good clean thru!! i cant see any leaks from vacuum hoses.

Any ideas would be great as i,m at a loss.

Cheers
Tony.,.,

 

I'd do the spray est with wd40 or similar looking for leaks on the inlet, then check the co, as could be very lean.
tabetha