2001 gmc somona still sputtering and sometimes stalling after fuel pump change and new spark plug and wire change. We cleaned fuel injectors and changed fuel filter. Need HELP asap!!!

This I think would be either of two things, it could be your fuel filter or your fuel pump, hope this helps

catalytic converter clogged.

MAF mass air flow sensor.

are any of the other plugs wet if not i would go to the junk yard and get 2 used injectors i doubt it did anything to converter if other plugs are wet to i'd say you need a new fuel rail and injectors kerosene probley melted or plugged the rubber inside put lots of gas in it to delute kerosene not just 5 gal and maybe a bottle of drygas kerosene sometimes has water in it

It sounds like a cam Or crank sensor problem (which controls the coils) I can only advise u from here to find a new CAR GUY. Good luck

it could need a fuel injector cleaning or replacement if an injector has a problem.check the air filter as i`v seen them so plugged to cause this type of problem.there could also be a problem with the throttle position sensor(tps)not sensing the proper voltage increase when moving the throttle.i guess you installed a new fuel pump not a used pump but sometimes even a new pump is defective and the fuel pressure and volume should be checked.it`s also possible the catalytic converter is plugging up and needs to have the exhaust back pressure checked.at idle the pressure should be less than 1lb pressure and at 2,000 rpm`s should be less then 2.how dirty was the filter when it was replaced it could need changing again if there is alot of dirt in the fuel system.

It is probably your electric fuel pump. Or it could be the fuel pickup filter inside the fuel tank, Either one is a pain to fix. When you say you had fuel system cleaned, was it done by a shop with a machine that cleans the fuel rail and injectors. Or did U pour some fuel system cleaner in the tank or throttle body? Also, was the throttle body cleaned when U had the fuel system cleaned? If not this could be a problem also. email me a [email protected]

Missing is usually associated with the ignition system. Check the ignition module and possibly try to check the individual spark plugs. The easiest and safest way to do this is by using an induction timing light and look for inconsistencies in the spark pattern of each plug lead.

change plugs wires also .fill gas tank up put prestone or gum out fuel injector cleaner.drive car around several miles.give injector cleaner time to clean out injectors.wait until engine cool .change fuel filter.relief fuel pressure before changing fuel filter.

there could be several possibilities, first did you change the fuel filter? most often times a partially plugged fuel filter will cause the sputtering. plugged fuel filters generally lead to the failure of the fuel pump. if you have a fuel injected vehicle the injector themselves can fail, this happens often especially if regular maintenance doesn't happen. i always use an injector cleaner additive when i fill up each time. a common symptom of sputtering is a plugged catalayic converter. the engine needs to breath to run right. also check the airfilter this is important for the engine to breath as well as proper fuel air mixture. if the engine senses a loss of power due to low fuel air mixture it will try to pump more fuel then it should therefore it's basically flooding itself. try these basic fixes first. if this doesn't solve the problem then post back with more detail and i will try a different approach.. please rate this thanks.