2004 jeep wran 2.4 bucks on hills

Sounds like restricted fuel flow...new correct fuel filter? Air/Fuel mixture...while idling...turn each screw clockwise until slight stall...then back out (counter clockwise) one and a half turns to smooth idle...Hope this helps.

W.O.T. MISFIRE< that is what you have.!
is the CEL lamp glowing running , and for sure WOT?
yes, then scan it, get the codes, P0300? P030x? what is it?
DON'T NOT IGNORE THE CEL,
hell, id scan it and look for pendings,!!! and freeze frame fails.
i would, id not leave that stone unturned, not me....ever.
it is the first after a tuneup full, i look for troubles even marginal.

Ever to a full 60,000 mile tune up? (fuel filter?) not just plugs?
spark wires, see the list. , ,wires and plugs and filters.. skip this service, means long hard and difficult troubleshooting.


2.4L I4,
if fuel pressure is good on hills its not the pressure side. 49psi.
but the car has a fuel pressure regulator, and we test that at the pump test, its part of pump, if not skipped. with gauge, we make dang sure it regulates.
new fuel pump , means zero to me
49 psi pressure now that matters, what if the reg is bad or the
12v power to pump is 6v, bad.
and not doing the leak down test at the pump pressure
test , misses the injectors leaking, or the balance test shows
clogged injector on say #1 . (not equal)


Real tune up done, and no DTC errors store, or pending.

only hills, can be
clogged injectors
MAP reading wrong, (clogged vacuum input to it)
when you WOT the throttle (wideopenthrottle) the MAP pin1 voltage
changes to 1Bar, (atmospheric, or 0 vacuum)
see page 31 in fuel system section of FSM.
the page is weak, no graph, but 0v (near) is very high vacuum and
4.6V at WOT, sea-level reading)
using absolute pressure method not vacuum (which i like)
is 0v is zero pressure (huge vacuum)
is 4.6v at full atmospheric pressure wot, the butterfly TV is wide open.
at keyon, no start the map is at atmospheric, pressure, 14.7PSI
or 1 bar, pressure. (about)
so if you monitor the mAP voltage output and it goes new 0v at WOT
then its done its job. an the misfire is caused by other reasons.
just one voltage test, and bam. not MAP or clog there.
i check map key on, idle and wot. 3 readings. to prove good maps.
in most cases the clean map works every time. see that its nipple
end is clean, (vac, port)


the ecu reads the MAP and the IAT temp, and computes AIR FLOW
and MATCHES that. with 12.5:1 Air top fuel ratio.
(fuel injections works just like this on Speed Density Systems)

and makes full power. if spark is good, and compression is good.

if the injectors are clooged, it misfires, if the spark plugs foul, missire
if the injectors leak, again, misfire.
that is how it all works, cept the magic fuel; tables in the ECU.

the scan tool ECT showing, 180F or more holding hot engine?
no , then thermostat is bad and AFR is rich as heck.
Is IAT reading odd? not equal to ECT first check key on , in morning not started, is bad IAT. they become equal as you sleep. overnight
the air temp matches the water.... a very easy trick this test.
by careful observation, key on, no start.
the 2 sensors report in , even key on,. all the time.
using any scan tool (not old)

You've already replaced most of the stuff I've guessed, unless perhaps the fuel pump is faulty or there's something partially clogging the fuel line. Maybe put a fuel system cleaner additive to the tank? Other thing is perhaps the coil.

Check for back pressure in the exhaust. A plugged cat will cause the exact symptom you have described.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

1 Open the hood. Locate the fuel pump, mounted to the driver's side of the engine block, approximately midway between the front and rear of the motor.2 Loosen the fuel-line retention nuts on the pump with a tubing wrench turned in a counterclockwise direction. Carefully pull the fuel-inlet line and the outlet line from the fuel pump, being careful not to bend the metal lines. Have a rag handy for any fuel spills when removing the lines.3 Loosen and remove the two fuel-pump retaining bolts with a socket and ratchet. Place the bolts aside for installation of the replacement fuel pump.
4 Pull the pump straight out of the engine block and remove it from the engine bay. Scrape any gasket reside from the mounting surface of the engine block with a gasket scraper.
5 Place a new gasket over the mounting surface of the replacement fuel pump and hold it to the mounting surface on the engine block, lining up the mounting holes. Thread the original retaining bolts through the pump and into the engine block and tighten them.
6 Reconnect the fuel lines to the pump and tighten the fittings with a tubing wrench. Close the hood.

Did you ever give the car a tune up?? if the check engine light is on have the codes pulled at autozone or advance its free and post the codes here. Then we can have somewhere to start.
It ccould be any number of things by the year of your car it could be a catalytic converter, but that is assuming. have the codes pulled.

1 Ignition system not operating properly
2 Dirtyor clogged fuel injector(s).
3 Low fuel pressure. Check for proper operation of the fuel pump and for restrictions in the fuel filter and lines.
4 Fuel injectionor engine control systems malfunction.
5 Vacuum leak at the intake manifold or vacuum hoses.
6 Restricted air filter.
7 Fuel pump or pressure regulator defective.

The next step is fuel flow measurement. your description sounds like fuel starvation...this test focuses on volume over time.

Probably, you would have good flow, that would taper off and no longer be enough, after a short time...

sounds like a fuel pump like my 96 you want come help me do mine i had same problems ebay sells them for 100 bucks
What happen the gasket rotted at the top the pump and cloged the pump you can try magyver it like my friend did pulled the pump out the tank and labels all the wires and sprayed out the pump with air hose and water. ore just get new fuel pump like i did

Before changing you pcm try cleaning your egr valve. remove the valve and see if its stuck in the open position if so use a small pick to clean around the spring.