was up everyone i have an 87 blazer fullsize 305 auto w/od started missin and check engine light came on i jumped the plug code came out to est sensor, replaced that,ran great. about a week later while on a road trip got a loud backfire sarted runnin bad again ,but no check engine light.any ideas???
:banghead:

mike

what is a est sensor?

Also, reset your computer and see if it helps.

what is a est sensor?




electronic spark timing sensor