What Does a Backfire Indicate?

[GolfVenture]

I've installed new plugs, synced the carbs. Then on a test drive, the MKII sounded much better, better all around performance also. Then at one back road stop light, when I got the green light I throttled the VR when I shifted from 1st to 2nd or 2nd to 3rd, of which I can't recall it backed fired in the shifting process, when I left off the gas.

 

Does the Back Fire indicate I need to make an adjustment?

[muffinman]

I would think that the backfire is caused by the carbs probably needs a fuel air mixture adjustment.It could be a fuel problem lack of proper fuel pressure or flow.Have you changed the fuel filter? Hows the air filter? valve adjustment should not make it backfire

Jeff