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I suggest you look for a forum on your vehicle and ask them: vehicle make enthusiast . I had a problem with a Jeep that was stalling in traffic, did a search and found the answer ten minutes after I limped it home. Had a similar problem in a Ram pickup and it was the fuel pump. Sux because I had to drop the fuel tank to access. On a lot of trucks there is a way to lift the bed to access. Not necessarily your issue, but my experience is that if you find the right forum someone has the answer.Lol, thats the question we've been chasing for over a MONTH now! I'm not sure how mechanically inclined you might be ( or anyone else you may know) but I'm stumped and getting stumped-er... so I'll take every bit of help I can throw at her right now! The back-info is: about two months ago she started out with one incident of being real hesitant on acceleration, sputtered a bit like she was starved for something vital, then picked it back up sluggishly at first, then it was like nothing ever happened... she drove fine after that for a week and it happened again, twice in the same day... after that it was every other day, then every day, then every time she was driven, which is where it's still stymied...
here's what we've done thus far...
started with checking the fuel and air filters... air filter fine, fuel filter looked like it was full of muddy river water, complete with mud... changed the filter. After that we dropped the fuel tank, emptied out the gas which was sorta baby5#!t-green, cleaned the inside of the tank, dried it, in the meantime cleaned and dried the fuel lines. gave her fresh top tier gas.. no improvement.
after that the egr and maf sensors were visited and cleaned, the fuel rail cleaned out, fuel injectors did need to be replaced and were... still no improvement.
took the cat off and it was pretty dirty, so we cleaned it and put it back on, checked the vacuum lines- all good... and changed out the fuel pressure regulator and the sparks... the fuel pump works just fine... the throttle body has been cleaned out... and she's had royal purple fuel injector cleaner and mystery oil added to her fuel intake a couple times each.
and through all this we've had the same OBDII read of P0172, Bank 1... but we've also had an egr code, a vacuum leak code, a lean fuel situation once and then a rich fuel situation the rest of the time, a misfire code on cylinder 4, and all are cleared now except for the P0172, Bank 1 and rich fuel situation...
I'd love to be able to replace the air-fuel sensor and 02 sensor and at least check the coil packs (which I have no idea how to do)... because other than the pcv and the iac.. I don't think theres much else that could be the red herring here...
Tuesday is dads 1999 Toyota Tacoma 2.4L ATM regular cab.. so I HAVE to figure this out eventually.. but I'm a Door Dash driver... and broke after all this, so I'm stuck for a minute...
If you have any suggestions or tips or advice, I'd love to hear it!