Idle Issue \ power issue

[Yukon 95]

Hello All,

 

I have a 92 GMC C1500 with a 4.3L automatic trans

problem is

1. Hunting idle, that sometimes changes to a high idle

2. while in gear it has a bad hesitation and under full throttle bogs down until you decrease throttle just a little then it picks up and goes.

 

i have replaced so far plugs, wires, cap & rotor, coil

replaced intake gaskets due to a vacuum leak

map sensor, knock sensor.

 

 

any ideas?

 

[Yukon 95]

Up-Date: Issue fixed by replacing fuel pressure regulator.