Joined: Aug 2016

Posts: 24

Likes: 0

Hey I have been chasing down this problem down for a long time my camaro is a 92 z28 L98 the problem is that when it gets to 3500rpm it backfires and I have put everything new on it it’s got all new sensors vacuum lines and fuel pump fuel filters msd wires msd coil pack new distributor new pick up coil new ignition module map sensor distributor cap button and timed it to 6BTDC and I recently found out that when I unplug the EST that it don’t backfire so It has to do something with I was going to check the wires going to the ECM as soon as I can and it also has a new ECM