Are you buying Delco injectors from Rock Auto? I'm not a big fan of aftermarket parts in some applications and this would be one of them. Don't think I've ever had a bad injector in one of those engines but anything is possible. What is it doing? I see more coil problems on them than anything.
AC Delco injectors. I was mistaken, they're $40 apiece.
The truck was periodically throwing a check engine light - miss fire cylinder 5. Seemed to only happen when idling for long periods with the AC on. I couldn't get it to reliably throw a code though. I swapped coils and plugs around but the problem continued to occur on cylinder 5. I checked with my local shop to see if I should bring it in or wait for it to get worse. They recommended waiting but suggested in the meantime to run injector cleaner as it's likely an injector.
Now it's happening pretty regularly, even without the AC compressor running. Yesterday as I pulled from a stop it ran noticeably rough, then smoothed out. The MIL came on, miss fire cylinder 5. It's time to do something about it.
I've decided to replace the #5 injector and am inclined to do all 5 while I'm in there. Don't want to just throw away money though......
Edited by MiCarl, October 31, 2017 - 06:35 AM.