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My mother has a 99 JXI vert that has recently been giving her issues. She has a tune-up done recently which included plugs, wires, fuel filter, cleaned tb and intake, plus other stuff she probably didn't mention to me because she couldn't seem to find the reciept. Either way, it sounded like your typical tune-up, not sure about O2s.
She said she noticed it when taking slow turns and when she came to slow down to a stop on her inclined driveway, which made me think fuel delivery issue. Checked fuel pressure with a little ingenuity (why didn't chrysler add a schrader valve?), consistent ~53 lbs. Couldn't find a fuel pressure regulator to pull vac line off of. No vacuum leaks that I've detected with brake cleaner around intake and lines etc. Threw a new MAP sensor in today just to see what it would do, no help.
I can force it to stall whenever I want to usually. It happens when you're accelerating slowly from 1st and it goes into 2nd at low speeds. If you hit the brake as soon as it hits second, it will either stall or hiccup for a second or two then come right back to life. Happens a lot at drive thrus, parking lots, driving in traffic, etc. Also, an indicator that something is wrong to me would be that occasionally it takes two tries to start, or will start and somewhat stutter to life. Priming fuel system before start doesn't help this issue. But most of the time the RPMs shoot right up at the turn of the key and it acts like all is fine.
Sometimes if you just barely touch the gas, it sounds like its wanting to miss a bit, but when you push it past the 1mm point it smooths out. Wondering what voltage I should be seeing at the throttle position sensor.
When it does stall, bump it into neutral and hit the key and it fires right back up.
Hoping this is not the torque converter sticking or something weird, but if it was, I would assume there would be no occasional hesitation at start up.
Doesn't seem voltage related, lights are consistent brightness.
Not thinking crank/cam sensor because it doesn't just shut off randomly, it's pretty replicable and doesn't seem like an 'on/off' type issue.
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Might want to check the idle air control valve. It's supposed to prevent stalling when loads increase from the power steering or A/C when you don't have your foot into the gas pedal. (Parking lot maneuvering, drive thrus, bottom of the driveway, etc.)
When I had TB apart for cleaning, there wasn't much building on the IAC. I know its compensating because RPMs do fluctuate upward once it finally catches itself and you can hear it start hissing a little in the TB, but I'm wondering if it's not responding quickly enough or perhaps is no longer calibrated properly.
Stall issue at low speed, starts right back up
