3.0l no power , will not rev past 3000

[LeKid302]

Hi guys , it s been long time since i post here (sold my explorer a 2 years ago)

I have a Ranger 2003 3.0l , ran fine until yesterday.

Idle is perfect , but as i hit the throttle , it stumble , hesitate a lot , if i floor the throttle , engine will almost die but will rev slowly until 3000 but with some backfire in the intake. As I touch the throttle the engine have a bad miss.

there is no code , no freeze frame , nothing.

Is there a way to check fuel pressure ? i have nothing to check but if you have some advice.

thanks

 

[LeKid302]

Ok guys , i will add some info

Truck have 73000km
Fuel pressure is 60-65psi at idle or when revving

I jus did a road test and I can go to near 60mph but no power, need to be very gentle on the throttle. Did not hear any pinging or backfire. If I goes at wot it will accelerate very slow , around 45-50mph there is a kick down but the engine seems to float at 5500 and shift in third but continues to accelerate very gently. I spray some water/salt and check for spark blow with a ground and everything look fine. Got .986v at closed TPS and 4.55v at WOT. No glitch or OL in the entire range.

 

[LeKid302]

Temp right cats 475f inlet and 500f outlet
Left cats 390f inlet and 440f outlet
Dual cat is 250f outlet
Resonator is 300 outlet
Both manifold are around 425f