because it doesnt like you
The defroster is drawing more electrical current than the alternator can produce. It could be that the belt is slipping and the battery is margianally low so that when you turn on the defroster the alternator can't keep up and the battery isn't able to provide enough current to keep the ignition operating.
A person should be able to trouble shoot problems in a car. A vehicle would stall out after starting because of a failure in the fuel system, or it could be a bad O2 sensor.
If the check engine light is on...might be a dirty EGR valve.
other culprits could be - bad intake gasket new or clean EGR clean connections on computer monitoring circuit check battery connectors/charge main wiring harness ground is loose the timing belt needs to be replaced
ECM
Your 1993 Isuzu NPR may stall when put into gear due to several potential issues. Common causes include a malfunctioning idle air control valve, fuel delivery problems, or a faulty transmission. Additionally, a vacuum leak or issues with the throttle position sensor could also lead to stalling. It's advisable to conduct a diagnostic check to pinpoint the exact cause.
It sounds like what mine did and mine was a bad coil but on a 3.2L there are 3 coils. I payed $100.00 for them to tell me this. but to find out for sure I would take it to a auto repair shop and ask them to do a diagnostic test for you.
An Isuzu Trooper may stall while idling at a stoplight due to several reasons, such as a dirty or failing idle air control valve, which can disrupt the engine's air-fuel mixture. Other potential causes include fuel delivery issues, such as a clogged fuel filter or failing fuel pump, and ignition system problems, like worn-out spark plugs or ignition coils. Additionally, vacuum leaks can lead to an unstable idle, causing the engine to stall. Regular maintenance and diagnostics can help identify and resolve these issues.
blown head gasket
First, if you have a check engine light then have a shop scan for codes. That will tell you what is wrong. If it is bad then it will stall, hesitate, and blow out black smoke.
I had the same problem in my 98' rodeo and the tube running to the EGR valve was clogged, taking the EGR valve off and spraying carb cleaner down the tube unclogged it and it fixed the problem
check the timing.