[freebird914]

New to GT's car just off the trailer engine cranks right up rough idle and a occasional back fire any ideas where to start???

 

[kwilford]

Solex or Weber? If it's a Solex, get a Weber...

Sounds like a vacuum leak. Do search on same and there are lots of helpful threads

 

[anastosmotors]

rough idle

1. I always start with testing ignition.[ either adjust points or
replace with electronic ignition].
2. check for vacuum leaks. vacuum hoses at the base
of carb.
3. check carb.

Pete

 

[Betta Carotene]

can check the timing. line up the ball bearing to the notch in the window on the bellhousing passengers side.

 

[freebird914]

Surging and backfiring

Help please... 69 GT idles fine and revs up without incident... But when driving it starts to surge and backfire.... Tried spraying carb cleaner around carb and hoeses in fact replaced hoses no difference... Weber carburators....

 

[Betta Carotene]

try looking at your igintion points in the distributor make sure they are gapped correctly and check the wires goign from cap to cyls and cap to coil.HTH

 

[freebird914]

Will check the wires been switch to electronic igintion...

 

[freebird914]

Replaced vacuum lines ... And found leak in fuel hose... Runs great now thanks

 

[kwilford]

Replaced vacuum lines ... And found leak in fuel hose... Runs great now thanks

So, does that mean it was a vacuum leak?
By the way, I merged your two threads. Please only post one thread per thought. And only one thought per thread. If you get what I mean

 

[freebird914]

Will do in future kinda combined the threads .... Sorry.

Vacuum leak and a fuel leak ....

 

[kwilford]

Will do in future kinda combined the threads .... Sorry.
Vacuum leak and a fuel leak ....

No worries, I just wanted to remind you, was all...
Glad you found the culprit. SO many conditions get blamed on a vacuum leak that are something else altogether, but yours just seemed to fit.