Loses acceleration, shakes, judders, high temp

Hi All,

I am having some problems with my car since some weeks now. It runs fine downslope but the moment it runs upslope for some time and gets stucked in traffic, it loses acceleration and shakes, judders a lot. The temperature shoots high up. I have to stop the car on a layby for some time. Then it will run fine again. But if I go upslope again, the same problem occurs.

I have changed air filter, oxygen sensor, cleaned the injector, changed spark plugs, exhaust, petrol pump. The problem is still there.

Would be very grateful if someone could help. I'm tired with this. I've already spent so much much money but no amelioration.

Could it have something to do with the idle speed sensor??

PLEASE HELP!!!! :(

Hem