I am at the end of the road with my 1990 Maxima! I have replaced the coil,plugs,wires,ran enough fuel injection cleaner through it to supply a fleet, and to no avail...the car still sputters in idle and while driving. it lacks power when driving normally but has plenty when the pedal is to the metal. Can anyone help? I cant afford to take it to a garage.

There are couple of things to check, timing,fuel filter,intake for vacuum leaks.