Ok I have a 77 280z all stock. What happens is it will un fine everything thing is fine then the fuel pressure will drop down to about 15-20 psi. It will run like this for a minute or so then will hop back up suddenly and be at about 50-55 psi then go back to normal.
I have replaced the afm, fuel pump, checked my connections, and still am stumped. Has anyone else experienced this problem?
My thughts are that there might be debris in the tank (the car has sat for about a year) and it will clogg the system temoparily then push past or move causing the sudden spike in presssure. Does this sound reasonable. Anyone have any thoughts?