/o/, I need some help. Recently dusted my 96 Cherokee 4.0 SE

How long was it sitting? Did you drain the old gas?

>>15850491
Replace Fuel filter, put high octane and a water treatment additive, drive out a full tank. Refill and see if problem still there

I'd say replace gas cap gasket but you're pre odbii tank vacuum check

Also you changed oil right?

>>15850536
It was winter vehicle for family so driven maybe three times a year. Haven't done oil yet, but level, pressure, and coloration/consistency are all good. Would bad oil cause a bad air to gas ratio?

>>15850554
Water treatment additive? Like injector cleaners? Or is that something entirely different?

>>15850583
No it's specifically for water in gas. Dump in then fill tank.

>>15850611
Run the tank out first right? Is high octane okay to run through that engine?

>>15850616
No, add treatment then fill w high octane, then run out the tank, then fill again and see if problem remains. You're trying to make decent gas out of what had been sitting, then empty the tank and start over.

Don't forget fuel filter, cheap as dirt and an easy diagnostic fix

My 4.0L always ran better on high

>>15850491
replace:
>throttle position sensor
and
>any vacuum tubes or valves in the engine bay
you're welcome
>>15850616
its fine but you're spending more to net less power from the engine

>>15850649
Isn't mixing octane bad though? Shouldn't the tank be empty before adding the higher?
>>15850654 throttle position sensor, how hard a replacement is that?

>>15850826
Mixing octane is fine.