How to fix a jeep cherokee running away

What is your question?

Guys can anyone help... i have a jeep cherokee with a 2.1 diesel engine (it's a different engine, a renault 4x4 engine ). The problem is that when im going uphill and rev it up it starts running away(run away diesel), however if i drive through the city (streight road , no hills) the jeep drives fine, when it starts running away up hill the engine oil starts to come out the exhaust and there is a lot of smoke but as i mentioned when im driving streight( no hills) it does just fine and it doesn't smoke a lot. Does anyone have any suggestions on how to fix it plz help...

What makes this problem better or worse?

when driving up hill it starts running away

How long has your 1992 Jeep Cherokee had this problem?

about 1 year +