[southern approach]

Just had motor rebuilt.after found the moon key on flywheel sheared replced that.all wiring grounds etc are in the right spots, plugs look good.engine is backfiring bad.timing is good.need help

 

[Sequoiha]

could be leanspitting, maybe link and sync,, also did they service the o2 sensor,, this is very important,,,

 

[southern approach]

don't know if they touched the o2 sensor.we took it off and it looked fine.we put way to much money in to it to have it rebuilt and now it doesn't run right.what else could it be?

 

[Sequoiha]

I would start with link and sync,,, and I cant look at an o2 sensor and tell if it is ok,, it needs to be checked, I would be glad to help you out on this,,,