I have an 02 blazer and about 3 months ago one of the starter fuses blew causing my ignition to lock up so my key was stuck in the start position for about 10 mins. The starter finally went out and the car just cut off but the key still would not go to the off position and come out of the ignition. We pried the key out but the ignition was still working fine after replacing the starter. After relacing the starter the car would still not start so we had to bypass the anti-lock. After these 3 months, we decided to replace the key cylinder and the ignition. We did that about 4 days ago. Yesterday when we started it it started and ran fine then stalled out and now it won't stay started. The battery is fine and the fuel pump is fairly new, it was just replaced in March. Does anyone know what it might be?

 

Like all cars, you need spark, air and fuel. There are threads on checking each. Air is normally easy but to check the other two it is worth looking at the instructions others have posted.

For the ignition, there is a technique to check the spark at the coil. I cannot be sure but you need to do this in the right way to be sure your test results are meaningful and do nor harm the ignition system (I think). For the fuel, a standard test of the fuel pump and fuel deliver system is to check the pressure at the fuel supply line where it gets to the top of the engine. And unfortunately, a failed pump after a replacement is no unheard of.

Good Luck