Ghost starts and alarm trips
 

Need some help badly. I have a 2000 Blazer with an aftermarket Avitel starter. Recently the car had some odd things happen. First the alarm went off, for about 30 seconds, and stopped on its own. The doors were unlocked, so it shouldn't have tripped from shaking or anything, and the key fob has no panic button. The alarm shut itself off. Didn't think too much of it, until the car started on its own. Now I'm really confused. Fob was untouched. My temp fix was to disconnect the battery for the night, but while doing it, the car started, or attempted to start multiple times. PLEASE. Any help would be greatly appreciated.

Does it have an aftermarket security sys / remote start? Does your key fob say GM or Cherovelt? If not then you prolly do & I would check that for a bad wire or lose connection or just unplug it. That's my .02

We live on an approach path for f15 llandings. Sometimes their radio signals will open garage doors in our neighborhood

i have had something sorta similar. my older s-15 had an after market alarm in it and the doors would lock if you hit a bump and then a few times the engine would just turn off....

my fix, pull out the aftermarket alarm. all you have to do is remove the box. but right after you do, make sure it still starts. mine had a starter bypass in it, so the box had to stay, but i disconnected everything except the starter immobilizer. never had any more problems.

after market stuff eventually goes bad. you could always just get another and install it.

Thanks guys, ill use all your suggestions as best i can. hope it works.