1994 S10 Blazer 4x4 4.3 vortec automatic. ive replaced damn near every sensor under the hood plus the spider and fuel pump. it will start and run perfect but after you drive it for a while it will lose power and backfire through the intake when you try to take off. then if you shut it off for a while and start it again it will run just fine. im at my wits end here with this thing ive dumped a ton of money into it so i cant back out now any help would be greatly appreciated. thanks in advance.


Tom

 

sounds like the fuel pressure relief valve, it releases fuel when the pressure gets too high, have you changed this?