Hey all how are ya ..I'm new here and I'm having a problem I have a 95 z71 that is driving me nuts I have never had a truck do this before ..well I'll start out by telling you what it is doing it was hit in the rear end and then this started.. driving around town it runs good get on the interstate and get up to 70mph and the rpm's start falling off and it bogs ..you punch it and it picks up and takes off..after you get off the interstate and drive it for awhile it will run good again .. I have checked the timing it is good 0 degrees with the wire unplugged I have replaced the disturber. EGR valve . rebuilt the TBI with new injectors ..replaced the fuel pump fuel press. is 11psi all the time even when it starts to mess up ..the exhaust has been replaced with a new cat. and have changed the ECM .and checked all grounds ...any help with this will be big help ...because I'm lost... thanks...

 

Ok I found the problem...

 

I was gonna guess the ECU might have been damaged, dirty fuel fulter, or dirty injectors.
What was it?

 

Be nice those that post for help, would post if that "fixed it", and what did fix it