I had that problem. the car would backfire and shut off. it turned out that one of the valves wouldnt close all the way, and it would backfire through the head. i dont know a lot about cars, but this was my problem. replaced one of the valves and it was fine.
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There are a range of thing that could cause this. Check the mass air flow sensor if it is dirty carefully clean it... Make sure your vacum lines are in good shape and have no leaks... Also check fuel system from pump to injectors. That did it for mine
The emissions controls, vacuum hoses etc are likely blocked up causing a lack of response from the engine when pulled into gear.
Most auto's have an anti stall device. There are several devices that need to be cleaned and or hose checked for blockage or wear/leaks around the engine/trans to determine the fault. Bear in mind this is a 24 year old car and may be just needing a little TLC.
Could be a long list of things including dirty injectors or a leaking EGR valve. The coil could be weak or the distributor cap and rotor may be shorting to ground. Has the fuel filter been replaced ? You'll have to go down the list and try to eliminate components to narrow down your options. Does it happen all the time, only when you are accelerating, etc.
clean the idle air control valve and pcv valve with spray carb cleaner. The IAC controls idle speed but gets gummed up. The pcv valve may cause a vacuum leak as well so clean or replace. And lastly clean the throttle bore and butterfly valve using an old toothbrush and some towels. Check the electrical connection at the IAC for security and corrosion and clean as needed.
In general, yes. This is a carb tuning issue. Another possibility is a vacuum leak somewhere, but most likely, it's a carb issue. You'll typically see your rpm drop a bit when you put it in gear, but that it sometimes stalls out points to a carb issue.
For the 3.3L V6: Firing Order: 1-6-5-4-3-2 Cylinders:
........(back) 2.........4.........6 1.........3.........5
........(front) Ignition Coil Connections:
o <--1 o <--4
o <--5 o <--2
o <--3 o <--6
new carbs are expensive, don't even thik about a use one, find someone who has experience rebuilding carbs, usually an older mechanic like me, i figure around $350.00 , it should take a couple of days couse it should soak overnight in cleaner,
check for vacuum leaks at your throttle body, intake manifold gaskets and vacuum line, or you could possibly have a sticking valve. if I am understanding you rite the truck sat for 2 years. also check the wiring to your sensors as for a rodent may have chewed some insulation off, this happened to my sons car.