Hey guys, new to the forum i have an 03 blazer have changed fuel pump,fuel pump relay and also replaced inline mega fuse under battery box. Truck will start no problem and run perfect the rpm's will spike twice the engine rpm will drop and shut off no cel. After truck shuts off battery light is the only light on.Also volt gauge reads just below 14 volt in cab.

Any help would be great thanks in advance guys

 

The first step is to find out if you're losing fuel pressure or electrical/spark when it quits. Post your results.

 

It also sounds like your coil may be heating up!Just a sugesstion-these tend to fail under high heat conditions! These will run fine cool then:SPLAT with a full ignition circuit and fuel pressure...