Trying to solve a misfiring problem with my 96 gsr
so far have replaced coils, spark plugs, and have tested injectors which all seem to have good spray
Problem is have been test driving it up and down my road and have found that if you hold at a certain throttle position as your driving it hauls *** with no misfire but as soon as you touch above that throttle it starts to buck and misfire and then WOT you feel way less misfire but is an absolute slug and can't see to figure out what's causing it any help appreciated

 

Make sure the vacuum line is attached to the FPR

 

have just check it its all connected whats the 3 port solenoid for in between the line one end of it is capped off and has mitsi logo on cap so assume it factory

 

It's the cold start solenoid. It closes so the FPR
Doesn't see vacuum on cold starts. Increasing fuel pressure to get more fuel in