Intermittent problem with 2009 Hyundai Sante Fe whereby engine light comes on and I can't go beyond 40 kmh and even less when climbing hills. Both my mechanic and the local Hyundai dealership are not sure (or at least not convinced) it's the the throttle b/c the problem is only intermittent. So far $400 and problem is still there and recurring more frequently. Any ideas?

I would go to a salvage yard and pull off a different throttle body. That should solve the mystery. There's one on Ebay for $112.50.

Thank you.

It could be a problem in the emissions pressure and purging system also. Had a similar problem on my 2001. There is a check valve in there that was bad and caused a hard start problem after fuel fill-ups. Did they check for any stored engine codes? Most times when the light comes on it will trigger a code and it will stay in memory. A good code scanner will also tell you that the problem is intermittent (corrects itself) but it will retain the code in the memory so it can be traced and fixed. If they have done this and still can't find the problem, I would lean towards the throttle body, but keep in mind it can also be a sensor or combination of sensors that are going bad and for some reason not giving you a trouble code. Keep us posted please.

Do and scan...Do You have an ABS light on also?

This is bowbender I have the same problem and my abs light is staying on