1996 isuzu rodeo keeps reading #2 misfire runs good xcept when cold it hesitates most times or jus occasionally hesitates then the check engine light flashes and its guzzling gas i only got 50 miles on a half tank of gs( i know WOW) ive replaced mass airflow throttle position sensor egr valve new plugs and coil packs filter o2 senors idle position sensor fuel injectors cleaned alot of carbin out of throttle body HELP

Lot of road, well done.... suggest a compression test.

As a test, replace plug 2 with new plug gaped 0.005 less than spec., see if it improves.

wow only one tiny hint there, MPG poor
sorry cant help with just that.
i can list 50 reasons,. to what avail.?

post driving symptoms,
it can be bad fuel.
and 50 more.

my guess is you are not asking how to do 3 to 10tests
but only want wild guessing
what you want , GUESSING or TeSTING?
and how to buy the iAC.
all stores sell it, what's the problem?
sure your not tell them, engine type.
and build year date, AUG,1st 1998 this part changed
. fact.s

the best thing to do is read any hidden codes in the transmission. not all scanners read that. second check input and output transmission solenoids

hot or cold engine,or both????????????????????
sure...
the ECU works OVERTIME; hard, to keep the engine running.
this is done by the action of the ISC valve.
so can you keep it running with a fast right foot??????????
a real mech needs to drive car.
does it have full power on hills?
is the tune up service done, the 60kmile repeats and needs to be done.
the ECU can not keep idle right on any engine that runs like crappppppp.

1: all fuses good.
2: engine never warms to normal 180F+ temp and hold???
3: not tuned up.
4: engine misfiring.
5: engine flooding.
6: engine starving for fuel.
7: OMG, the ISC wires fell off, (inspections do work on old cars)

there are simple tests. for each case.
one more #8. EFI system lost 12vdc power. stalls.
12.6vdc not running, 13.3v -15v running.

you could have a vacuum leak somewhere. check the fuel filter, it may be going bad. and battery. all these will cause a random misfire code. as well as your plug wires. intake air leak, spray carb cleaner around intake manifold while engine is running if the idle changes, then you have a leak. Good-day! but check for vacuum leak first! a vacuum leak will cause engine to hesitate and lose power.

Is #2 injector firing?
Do It Yourself Diagnosis and Repair

Do you have the exact code? An aftermarket coil can still fail, especially if it is not designed for your ignition system and the output/input readings expected by the ECM. No matter what, it is worth a try, it is not difficult to change it out. But I would still like to know what the actual code is.

1996 isuzu bighorn, diesel the engine check light comes on and when it does the rev counter stops working and engine runs rough and stalls

The upper intake gaskets may be leaking. They are made of plastic and metal and will leak air. Do not remove the cover on very top of manifold when changing.

If the check engine light is on have it read for the engine problem code. then google that code which will tell you where the problem is coming from.