Ignition or fuel problem probably . When you turn the key to start does the engine spin ? Crank no start or nothing happens NO CRANK - NO START ?
If the engine spins an does not start an run you need to test to see what's missing Spark or fuel . Pull a spark plug wire off a spark plug an stick a screw driver in the end an hold it near ground (metal) and have someone try to start the vehicle ! Is there spark ? Spray starting fluid into the engine , does it start then ?
Videos on youtube showing how to do these tests
SOURCE: Car stalling under acceleration
bad fuel pump it i about to go out but hasnt gone completely out yet
SOURCE: car idles low, stalls after start
Common issue at the shop (i'm a ford technician), here is what I do to correct it.
Here is the most common cause of surges and stalls at stops and low erratic idle speed and rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
SOURCE: 1996 Mercury Mystique 2.0L stalling
Drive it to Autozone or similar place and ask them to scan the car because the "check engine light is on". Most likely it will be a TPS switch. In area of $30 for part. It takes about 20 minutes to do. Most of time spent getting to part. But see what scan shows.
SOURCE: 1999 mercury cougar engine races
you can have someone check the IAC sensor,it keeps the Idle in check,
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SOURCE: car wants to stall when first starting out
replace fuel filter and if that dont work check spark plug wires
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