Rattling Engine, Rev problems

[Jshane91]

Good day friends, I have a 2007 KSP90 vitz with the 1kr-fe engine and an automatic transmission. My Problem:I recently replaced the oil pump and did a full service, my car is approximately 96k km on the clock. The car starts but only idles when cold. When it warms up it cut offs the engine. You can only hold idle by gently pressing the accelerator. When you rev the engine, it rattles and the engine starts shaking excessively. The orange engine warning light shows up and flickers. The car drives but does not want to increase revs and speed. Please help as this is my only source of transport and I really love the car and don't want to replace or sell. Thanks alot in advance.