I have a problem with my Tayota seina 99modell.When i idle it 4 about 2mins,it cease power and began to move slowly,having difficulty to climb a hill,but when i remove the battery head terminal and put it back again, it regains power again. Then after sometime, it return back to slow movement. I have change 5 fuel pumps, lead wire,coil,fuel filter,plugs,clean the nozzle, clean injector mouth, change air filter.What might be the cause of this problem now?

ernestce:
I have a problem with my Tayota seina 99modell.When i idle it 4 about 2mins,it cease power and began to move slowly,having difficulty to climb a hill,but when i remove the battery head terminal and put it back again, it regains power again. Then after sometime, it return back to slow movement. I have change 5 fuel pumps, lead wire,coil,fuel filter,plugs,clean the nozzle, clean injector mouth, change air filter.What might be the cause of this problem now?

Run a scan first