The 4G63 engine has a electronic throttle body.
The engine runs good at idle but I have a back fire when accelerate and not smooth down to idle. It cannot run on high R.P.M..
I replaced spark plug wires , distributor's cap and rotor.
The vapor regulator was too old and dirty, so I also replaced it.
It still has back fire and not be able to run on high revolution and not smooth down to idle. I don't know if it need scanner tool which I don't have one.
How to diagnosis this problem?
Any advice would be appreciated.