shuts off no warning

[lorri2007]

I have a 98 blazer just started about a month ago i will be just driving along and it just shuts off like some reached over and turned the key off i have no power what so ever all the gauges and lights on the panel blink on and off and go haywire then i wait till all my lights come back on and then it will start right back up but it has done it to me too many times please help

[DelCoch]

Sounds like you might have a bad ignition switch or ignition harness. Try giggling the switch when it shuts off, and see if that makes any difference.

I would also pull the fuses for the ECM (should be 2) and make sure they look good, check the spades of the fuses for corrosion.

[muddog321]

After that ignition stuff is checked, let me ask if this only happens at idle? If so and it gives a little shake/stumble right before I'd look at the idle air control (IAC) on the throttle body (need to pull throttle body off to replace and clean the ports/butterfly. If more random I'd test the fuel pressure and rule that out, cap/rotor new and not cheap aftermarket ones, and then my favorite no code thrower is the crank sensor or loose connector going intermittant (again get a Delco or Standard).
Hey welcome to the forum and lots of Blazer problems and fixes are listed just remember that even GM has to step thru many possible parts/sensors to find intermittant failures. Always buy Delco or I have no problems with Standard motor products parts but some of those discount ones are trash and will keep biting you.

[BlazerBoyLT98]

Also check the power cables running from the battery to the electrical in the truck. I had a jeep that had corroded wires and the only way to get the truck going was to move them around on the battery terminal. Of course once I replaced everything which was the correct way of doing things it all worked out fine.